Question

 A and B can together do a piece of work in 15 days. If A alone can do it in 18 days, how long will B alone take to complete the same work?​

Answer 1

Answer:

90 days

Step-by-step explanation:

let days taken by B be x then B' s 1 day work will be 1/x

A' s 1 day work = 1/18

A+B' s 1 day work will be 1/x+1/18

1/15=1/x+1/18

1/15-1/18=1/x

LCM of 15 and 18 is 90

6/90-5/90=1/x

1/90=1/x

therefore A will take 90 days