SOLUTION: How many cups of a 10% acid solution and a 25% solution need to be mixed to make 6 cups of a 15% solution?

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Question 952773: How many cups of a 10% acid solution and a 25% solution need to be mixed to make 6 cups of a 15% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many cups of a 10% acid solution and a 25% solution need to be mixed to make 6 cups of a 15% solution?
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Equation:
acid + acid = acid
0.10x + 0.25(6-x) = 0.15*6
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10x + 25*6 - 25x = 15*6
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-15x = -10*6
x = (2/3)6
x = 4 cups (amt. of 10% solution needed)
6-x = 2 cups (amt. of 25% solution needed)
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Cheers,
Stan H.
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