Question

A can do a piece of work in 80 Days. he works at it for 10 days and then B alone finishes the remaining work in 42 days. in how many days could both do it?

Answer 1

acc to my level

a complete work in =80 days
b complete work in =42 days
l.c.m of 80 and 62=1680
1680÷80=21
1680÷42=40
40+21=61 days answer
soft trick
it may help u guyz