Question

15 boys can do a piece of work in 18 days how long will 20 boys take to complete the work

Answer 1

Answer:

13.5 days (~14 day)

Step-by-step explanation: 15 boys finishes the work in 18 days. Therefore, 1 day work of 1 boy is 1/(15*18). Thus, 1 boy alone takes 15*18 days to complete the work. Similarly, if 20 boys are working for x number of days, then 1 day work of 1 boy is 1/(20*x). Thus, 1 boy alone takes 20*x days to complete the work.

15*18=20*x

x=15*18/20=13.5 days