Multiple choice

Efficiency of A : B : C is 5 : 4 : 3, working together they can finish a work in 25 days. Then in how many days B and C together will take to do 35% of same work? A : B : C की दक्षता 5 : 4 : 3 है, एक साथ मिलकर वे 25 दिनों में एक काम खत्म कर सकते हैं तो कितने दिनों में B और C एक साथ मिलकर उसी काम का 35% समाप्त करेंगे?

  1. 15

  2. 12

  3. 10

  4. 18
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A Correct answer
Explanation

Efficiency ratio A:B:C = 5:4:3. Total efficiency working together = 5+4+3 = 12 units/day. Work completed in 25 days, so total work = 12 × 25 = 300 units. B and C's combined efficiency = 4+3 = 7 units/day. 35% of work = 0.35 × 300 = 105 units. Time for B and C to complete 105 units = 105/7 = 15 days.

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