20 girls can complete a work in 16 days. 16 boys can complete the same work in 15 days. What is the ratio between the capacity of a boy and a girl?
Show answer & explanation
Correct answer: C
Explanation
20 Girls → 16 Days
16 Boys → 15 Days
20 Girls × 16 Days = 320 (Total Work)
Efficiency of 1 Girl = (1/16) × (1/20) = 1/320
16 Boys × 15 Days = 240
Efficiency of 1 Boy = 1/240
Boy : Girl = (1/240) : (1/320) = 320 : 240 = 4 : 3