Question

a can do a piece of work in 14 days while B can do in 21 days they begin together but three days before the completion of the work areas of find the total number of days taken to complete the work

Answer 1

Answer:

A's Idays work=1/14

Bis. = 1/21

A+B's. 1/14+1/21

= 3/42+2/42 = 5/42

A+B's 3 days work=5/42x3=15/42

= 5/14

Balance = 1-5/14 = 9/14

Balance 9/i4 completed by B in

9/14x2 I/1=189 / 14=I3 1/2 days

A and B worked for 3 days

B alone worked 13 1/2 days to finish the work

Total 3+13 1/2 = 16 1/2 days