Orange juice question

Question

One canned juice drink is 15% orange juice another is 5% orange juice how many liters of each should be mixed together in order to get 10L that is 7% orange juice

Answer 1

X+y = 10

0.15x + 0.05y = .7

15x + 5y = 70

15x + 5(10 - x) = 70

15x + 50 - 5x = 70

10x + 50 = 70

10x = 20

x = 2

y = 8