Selected MCQ

Current Question
A swimming pool is 24 m long and 15 m broad. How many men are required to complete the work?
  • A. 32
  • B. 36
  • C. 42
  • D. 46
Correct Answer: B
Explanation:
Work is proportional to area and rate.
Related Question 1
If X and Y complete a work in 10 days and Y and Z in 16 days, and X and Z in 22 days, how long does each take?
  • A. 120, 40, 60 days
  • B. 120, 60, 80 days
  • C. 40, 30, 120 days
  • D. 30, 40, 60 days
Correct Answer: A
Explanation:
Solving simultaneous equations gives values.
Related Question 2
If 9 workers can complete a job in 6 days, how many days will 3 workers take?
  • A. 12
  • B. 15
  • C. 18
  • D. 20
Correct Answer: C
Explanation:
Work = 54 ⇒ 54/3 = 18.
Related Question 3
If 8 workers can complete a job in 15 days, how many workers are needed to complete it in 10 days?
  • A. 10
  • B. 12
  • C. 14
  • D. 16
Correct Answer: B
Explanation:
Work = 8×15 = 120 ⇒ workers = 120/10 = 12.
Related Question 4
If 12 men can complete a work in 10 days, how many days will 15 men take?
  • A. 6
  • B. 8
  • C. 10
  • D. 12
Correct Answer: B
Explanation:
Work = constant ⇒ 12×10 = 15×x ⇒ x = 8.
Related Question 5
A, B, and C can complete work in 8, 14, and 16 days. How many days will A alone take?
  • A. 13
  • B. 11
  • C. 12
  • D. 15
Correct Answer: A
Explanation:
Derived from partial work relation.