Math MCQ Questions with answers

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Here Important Math MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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Q. A can do a work in 30 days. B is twice as efficient as A. In how many days can B complete the work?

  • (A) 10 days
  • (B) 12 days
  • (C) 15 days
  • (D) 18 days
📝 Notes
✅ Correct Answer: (C) 15 days
Explanation: If efficiency doubles, time becomes half. Therefore B takes 15 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A can complete a work in 40 days. He works alone for 10 days. What fraction of the work remains?

  • (A) 1/4
  • (B) 3/4
  • (C) 2/5
  • (D) 5/8
📝 Notes
✅ Correct Answer: (B) 3/4
Explanation: Completed = 10/40 = 1/4. Remaining = 3/4.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A can complete 2/3 of a work in 12 days. How many days will A take to complete the whole work?

  • (A) 16 days
  • (B) 18 days
  • (C) 20 days
  • (D) 24 days
📝 Notes
✅ Correct Answer: (B) 18 days
Explanation: Whole work = 12 × 3/2 = 18 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A and B together complete a work in 8 days. If A alone can complete it in 24 days, B alone can complete it in:

  • (A) 10 days
  • (B) 12 days
  • (C) 16 days
  • (D) 20 days
📝 Notes
✅ Correct Answer: (B) 12 days
Explanation: B's rate = 1/8 − 1/24 = 1/12. Hence B takes 12 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A completes a work in 18 days and B in 36 days. If both work together for 6 days, what fraction of the work is completed?

  • (A) 1/2
  • (B) 2/3
  • (C) 3/4
  • (D) 5/6
📝 Notes
✅ Correct Answer: (A) 1/2
Explanation: Combined rate = 1/18 + 1/36 = 1/12. In 6 days they complete 6/12 = 1/2.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A can complete a work in 10 days and B in 15 days. After working together for 4 days, what fraction of the work remains?

  • (A) 1/3
  • (B) 2/5
  • (C) 7/15
  • (D) 8/15
📝 Notes
✅ Correct Answer: (A) 1/3
Explanation: Combined rate = 1/6. Completed in 4 days = 2/3. Remaining = 1/3.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A completes a work in 21 days while B completes it in 28 days. Their combined time is:

  • (A) 11 days
  • (B) 12 days
  • (C) 13 days
  • (D) 14 days
📝 Notes
✅ Correct Answer: (B) 12 days
Explanation: Combined rate = 1/21 + 1/28 = 1/12. Hence time = 12 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A can complete 3/5 of a work in 18 days. How many days will he take to complete the entire work?

  • (A) 24 days
  • (B) 28 days
  • (C) 30 days
  • (D) 32 days
📝 Notes
✅ Correct Answer: (C) 30 days
Explanation: Whole work = 18 × 5/3 = 30 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A can complete a work in 14 days and B in 21 days. Their combined one-day work is:

  • (A) 5/42
  • (B) 1/7
  • (C) 3/14
  • (D) 2/21
📝 Notes
✅ Correct Answer: (A) 5/42
Explanation: Combined rate = 1/14 + 1/21 = 5/42.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Q. A is 50% more efficient than B. If B takes 24 days to complete a work, A will complete it in:

  • (A) 12 days
  • (B) 14 days
  • (C) 16 days
  • (D) 18 days
📝 Notes
✅ Correct Answer: (C) 16 days
Explanation: A's efficiency = 1.5 × B. Time = 24/1.5 = 16 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

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