Question

1. Milk-man has 300 litres of milk at a rate of rs.19/lit. After adding 200 litres of water he sold 400 litres for rs.20/lit and he added 10 liter of water to the remaining milk and sold it for rs.15.What is his profit?

Answer 1

1850
total expend : 
300*19 + 200*10 + 10*10
total earned : 
400*20 + 110*15
substracting we will get 1850