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 complete a work in 27 days. After working for 9 days, he leaves. What fraction of the work is completed?

  • (A) 1/4
  • (B) 1/3
  • (C) 2/3
  • (D) 3/4
📝 Notes
✅ Correct Answer: (B) 1/3
Explanation: Completed = 9/27 = 1/3.

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

Q. A completes a work in 9 days and B in 18 days. Together they complete the work in:

  • (A) 5 days
  • (B) 6 days
  • (C) 7 days
  • (D) 8 days
📝 Notes
✅ Correct Answer: (B) 6 days
Explanation: Combined rate = 1/9 + 1/18 = 1/6. Hence time = 6 days.

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

Q. A can complete a work in 35 days while B can complete it in 70 days. In how many days will they complete the work together?

  • (A) 20 days
  • (B) 22 days
  • (C) 23⅓ days
  • (D) 24 days
📝 Notes
✅ Correct Answer: (C) 23⅓ days
Explanation: Combined rate = 3/70. Time = 70/3 = 23⅓ days.

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

Q. A can complete 1/5 of a work in 6 days. The whole work will be completed in:

  • (A) 24 days
  • (B) 28 days
  • (C) 30 days
  • (D) 36 days
📝 Notes
✅ Correct Answer: (C) 30 days
Explanation: Whole work = 6 × 5 = 30 days.

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

Q. A completes a work in 45 days and B in 30 days. Their combined efficiency is:

  • (A) 1/15
  • (B) 1/18
  • (C) 1/20
  • (D) 2/45
📝 Notes
✅ Correct Answer: (B) 1/18
Explanation: Combined rate = 1/45 + 1/30 = 1/18? LCM 90: 2/90 + 3/90 = 5/90 = 1/18.

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

Q. A can complete a work in 12 days. B takes 18 days. If A works alone for 4 days, the remaining work is:

  • (A) 1/3
  • (B) 2/3
  • (C) 1/2
  • (D) 3/4
📝 Notes
✅ Correct Answer: (B) 2/3
Explanation: Completed = 4/12 = 1/3. Remaining = 2/3.

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

Q. A and B together can complete a work in 6 days. If B alone takes 18 days, A alone takes:

  • (A) 8 days
  • (B) 9 days
  • (C) 10 days
  • (D) 12 days
📝 Notes
✅ Correct Answer: (B) 9 days
Explanation: A's rate = 1/6 − 1/18 = 1/9. Hence A takes 9 days.

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

Q. A can complete a work in 32 days and B in 48 days. Their combined time to complete the work is:

  • (A) 18.2 days
  • (B) 19.2 days
  • (C) 20 days
  • (D) 21 days
📝 Notes
✅ Correct Answer: (B) 19.2 days
Explanation: Combined rate = 1/32 + 1/48 = 5/96. Time = 96/5 = 19.2 days.

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

Q. A can complete a work in 28 days and B in 42 days. In how many days will they complete the work together?

  • (A) 16.8 days
  • (B) 18 days
  • (C) 20 days
  • (D) 21 days
📝 Notes
✅ Correct Answer: (A) 16.8 days
Explanation: Combined rate = 1/28 + 1/42 = 5/84. Time = 84/5 = 16.8 days.

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

Q. A can complete a work in 36 days while B can complete it in 18 days. B is how many times as efficient as A?

  • (A) 1.5
  • (B) 2
  • (C) 2.5
  • (D) 3
📝 Notes
✅ Correct Answer: (B) 2
Explanation: Efficiency is inversely proportional to time. 36/18 = 2.

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

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