Question

A can do a piece of work in 14 days while B can do it in 21 days then begin together and work for seven days then a feel ill and we had to complete the work in how many days was the work to completed

Answer 1

Step-by-step explanation:

A can finish the work=14days

A's one day work=1/14

B can finish the work=21 days

B's one day work=1/21

And B'sone day =1/14+1/21=3+2/42=5/42

AandB 's seven days work=5/42x7=5/6

after seven days A ill and left work

whole work=1

remaining work=1-5/6=1/6

how many days A alone finish remaining work=1/6x21=7/2 =6whole1/2 days