Selected MCQ

Current Question
18 men eat 20 kg of rice in 3 days. How long will 6 men take to eat 40 kg rice ____.
  • A. 20
  • B. 18
  • C. 32
  • D. 20
Correct Answer: B
Explanation:
Consumption ∝ men × days.
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
12 children take 16 days to finish work. Time for the same work with a different number is ____.
  • A. 3 days
  • B. 4 days
  • C. 6 days
  • D. 8 days
Correct Answer: C
Explanation:
Work is inversely proportional.
Related Question 3
A petrol tank lasts 10 days. If consumption patterns change, how long will it last?
  • A. 5 days
  • B. 6 days
  • C. 7 days
  • D. 8 days
Correct Answer: D
Explanation:
Adjusting the consumption rate leads to a duration of 8 days.
Related Question 4
A and B can do the work in 10 days. B alone can do it in 15 days. A alone will take ____.
  • A. 20 days
  • B. 25 days
  • C. 30 days
  • D. 35 days
Correct Answer: C
Explanation:
A’s rate = 1/10 − 1/15 = 1/30.
Related Question 5
P, Q, and R take 24, 6, and 12 days, respectively. Time together is ____.
  • A. 2
  • B. 3 3/7
  • C. 4¼
  • D. 5
Correct Answer: B
Explanation:
Sum of rates gives 3 3/7 days.