Answer:
Okay, so let's make the variable x the 60% juice.
The equation:
0.60(x) + 1(120-x) = 0.7(120)
Multiply both sides by ten for easier calculation:
6x + 1200 - 10x = 840
Put x on one side and the numbers on the other:
-4x = -360
the negatives cancel out...
4x = 360
define x
x = 90
Explanation: