SOLUTION: A metallurgit needs to make 3 oz of an alloy containing 76%platinum. She isgoing to melt and combine one metal that is 90% platinum and one that is 70% platinum. How much of eac

Question 163788: A metallurgit needs to make 3 oz of an alloy containing 76%platinum. She isgoing to melt and combine one metal that is 90% platinum and one that is 70% platinum. How much of each should she use?
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!

Remember:
x=amount of 90% platinum
y=amount of 70% platinum
So, --------------------> eqn 1
We get in eqn 1,
--------------------------> eqn 2
Also,
----------> eqn 3
Susbt eqn 2 in eqn 3:

, for 90%
Via eqn 2:
, for 70%
Check via eqn 3,

Thank you,
Jojo

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