Question 431704
If you need 10% of 10L of orange juice, then you need 10X.1, or one liter of pure whole orange juice.

X+Y=10
.15X+.05Y=1

Multiply the second equation by 20, we get:
3X+Y=20
X+Y=10

2X=10
X=5
Y=5

We need 5L of each orange juice.