SOLUTION: How much of an alloy that is 10% copper should be mixed with 300 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?

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Question 717735: How much of an alloy that is 10% copper should be mixed with 300 ounces of an alloy that is 70% copper in order to get an alloy that is 30% copper?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
ASSIGN VARIABLES
L=10%
H=70%
T=30%
u=UNKNOWN amount for L material
v=300 oz. for H material

Arrange Rational Equation
highlight%28%28uL%2BvH%29%2F%28u%2Bv%29=T%29
Solve for u, the only unknown variable.

Suitable steps should follow, and be equivalent to formula:
highlight%28u=v%28H-T%29%2F%28T-L%29%29.

Substitute known, given values to find the value for u.