Question

Satish takes 6 days to paint a house and ratish takes 12 days .If both of them work together how long will it take to paint the house

Answer 1

one day work of satish=1/6
one day work of ratish=1/12

when they both will do work together
then one day work of satish and ratish=1/6+1/12=1/4
so they will take 4days to do the same work
that is to paint the house