Question

You need a 35% solution. You are going to mix 15 liters of a 27% solution with an amount of a 50% solution. How much of the 50% solution should you use?

Answer 1

Let
`x` be the number of liters of the 50% solution used in the mixture. Then

`0.35(15+x)=0.27(15)+0.5x\implies x=8`