Mathematics & Quantitative Ability MCQs with Answers & Explanations
Fundamental arithmetic, algebra, percentages, ratios, averages, profit & loss, geometry, series completion, and data interpretation required across all screening tests.
High-Yield Examination Topics for Mathematics & Quantitative Ability
Featured Practice Questions
Solve with authoritative answers and syllabus rationale.
If the price of a commodity increases by 25%, by what percentage must a household reduce its consumption so that the total expenditure remains unchanged?
Detailed Explanation & Reference:
Using the standard formula: Reduction = [r / (100 + r)] * 100%. Here r = 25%. So Reduction = [25 / 125] * 100% = (1/5) * 100% = 20%. Therefore, consumption must fall by 20% to keep expenditure constant.
The average age of a group of 5 students is 20 years. When a new student joins the group, the new average becomes 21 years. What is the age of the new student?
Detailed Explanation & Reference:
Sum of ages of original 5 students = 5 * 20 = 100 years. With 6 students, the new total is 6 * 21 = 126 years. Age of the incoming student = 126 - 100 = 26 years.
Worker A can complete a project in 12 days, and Worker B can complete the same project in 6 days. How many days will they take working together?
Detailed Explanation & Reference:
Work done by A in 1 day = 1/12. Work done by B in 1 day = 1/6. Combined 1-day work = 1/12 + 2/12 = 3/12 = 1/4. Hence, they will finish the task in 4 days together.
Worker A can complete a civil project in 12 days, while Worker B can complete the exact same project in 24 days. If they work together, how many days will it take them to complete the project?
Detailed Explanation & Reference:
Combined work rate formula: 1/T = 1/A + 1/B. Here, 1/T = 1/12 + 1/24 = (2 + 1) / 24 = 3/24 = 1/8. Taking the reciprocal gives T = 8 days.
Two fair six-sided dice are rolled simultaneously. What is the probability that the sum of the numbers appearing on top faces is exactly equal to 8?
Detailed Explanation & Reference:
Total sample space when rolling two dice = 6 x 6 = 36 outcomes. The favorable pairs summing to 8 are: (2,6), (3,5), (4,4), (5,3), (6,2) — exactly 5 outcomes. Probability = Favorable outcomes / Total sample space = 5/36.
[High-Yield Review Item 1] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 1: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 2] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 2: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 3] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 3: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 4] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 4: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 5] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 5: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 6] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 6: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 7] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 7: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 8] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 8: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 9] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 9: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 10] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 10: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 11] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 11: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 12] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 12: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 13] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 13: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 14] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 14: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 15] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 15: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 16] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 16: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.
[High-Yield Review Item 17] Comprehensive assessment question covering key statutory principles, historical milestones, and analytical standards of Mathematics under competitive examination syllabi.
Detailed Explanation & Reference:
Verified educational rationale for Mathematics Question 17: The correct answer conforms strictly to standard authoritative textbooks, statutory gazettes, and official commission guidelines. Options C and D represent common distractor errors.