18 men can complete a piece of work in 5 days. In how many days can 21 men complete the same piece of work?
(a) 3 17/21 (b) 4 2/7 (c) 4 (d) Cannot be determined (e) of these
(b) 18 men can complete the work in 5 days. ?
1 man will complete the work in 18 × 5 days
21 men will do the work in 18x5/21 =30/7 =4 2/7 days.
