math
posted by cori .
one canned juice drink is 30% orange juice; another is 10% orange juice. How many liters of each should be mixed together in order to get 20L that is 15% orange juice?

if x is 30% then the rest (20x) is 10%. So,
.30x + .10(20x) = .15(20)
x = 5
So, 5L of 30% and 15L of 10%
Note how 15% is 3/4 of the way from 30% to 10%, so 3/4 of the mix is the 10% kind.
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