Question

A can do a piece of work in 14 days which b can do in 21 days. They begin together but 3 days before the actual completion of the work, a leave off. The total number of days to complete the work is? Select one: a. 13 and 1/2 b. 6 and 3/5 c. 10 and 1/5 d. 8 and 1/2

Answer 1

1/14+1/21=1/8.4

bfore three days a left therefore

5.4days they worked together and then a left

therefore

1/8.4+1/21=6

therefore answer is

6