Question

One canned juice is 20% orange juice: another is 10% orange juice. How many liters of each should be mixed together in order to get 10L that is 13% orange juice.How many liters of the 20%?
How many liters of the 10%?

Answer 1

let the number of litres of the 10% kind be x
let the number of litres of the 20% kind by 10-x

solve
.1x + .2(10-x) = .13(10)

Answer 2

I still don't understand?