Question

in a mixture of 60 litres the ratio of milk to water is 2 is to 1 how much quantity of water be added in the mixture so that the ratio becomes 1 is to 2

Answer 1

we divide the mix in 2:1
we get 40 Lt is milk and 20 Lt is water
we I'll do
40:20+x::1:2
product of means= product is extremes
80=20+x
x=60