Multiple choice

Pranesh can do a work in 15 days. In how many days will the work be completed by his brother Avinash if efficiency of Avinash is 60% more than that of Pranesh?

  1. 9

  2. 9.5

  3. 9.375

  4. 10
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If Pranesh completes the work in 15 days, his rate is 1/15 work per day. Avinash is 60% more efficient, so his rate is (1/15) × 1.60 = 1.6/15. The time Avinash needs is the reciprocal: 15/1.6 = 9.375 days. This is calculated by dividing Pranesh's time by (1 + efficiency percentage as decimal). Option C is correct.

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