Question

Example 16:
A and B can do a piece of work in 45 days and 40 days respectively. They began the
work together but A leaves after some days and B finishes the remaining work in 23 days. After
how many days did A leave ?​

Answer 1

Step-by-step explanation:

let take the eq 1 as

a +b =45. and a +b =40

work together means 2a +2b =95 ep 1

a-b =23. ep 2

multiply ep 2 by 2

then 2a -2b =57

2a+2b =95

4 a. 142

so a = 34

a left after 34 days