Time & Work / Pipes & Cisterns

JKSSB Junior Assistant · Numerical Ability · 35 practice questions with answers and explanations: 12 Easy, 11 Medium, 12 Hard.

Sample questions

Sample Easy question 1

If 8 men can build a wall in 15 days, how many days will 12 men take?

  1. 8
  2. 9
  3. 10
  4. 11
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Answer: C. Total work = 8×15 = 120 man-days; 12 men take 120/12 = 10 days.

Sample Medium question 2

A total of Rs. 900 is to be divided between A and B based on their work contribution. If A is twice as efficient as B and they complete a job together, find A's share.

  1. Rs. 450
  2. Rs. 500
  3. Rs. 600
  4. Rs. 700
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Answer: C. Since wages are divided in the ratio of work done (efficiency ratio 2:1), A's share = 900 × 2/3 = Rs. 600.

Sample Hard question 3

A does a job in 12 days, B in 15 days. They work together for 4 days, then A leaves. How many more days does B alone take to finish?

  1. 5
  2. 6
  3. 7
  4. 8
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Answer: B. Combined rate = 3/20; in 4 days, 3/5 is done, leaving 2/5; B finishes the rest in (2/5)×15 = 6 days.

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