Question

A
can do a piece of work in 10 days
and B in 20 days. They begin together but A leaves 2 days before the
completion of the work. In how many days will the whole work be completed​

Answer 1

Step-by-step explanation:

(a+b)'s one day work=(1/10+1/20)=3/20

according to the ques B alone did the work in last 2 days so B's 2 days work=2*1/20=1/10.

(1-1/10)=9/10 is the work which A and B together did.

no. of days=(9/10)/(3/20)=6.

total days=6+2=8 days.

ans:8 days.