SOLUTION: How many cups of pure granola must be added to 16 cups of granola that is 15% raisins so that the percent of raisins in the resulting mixture will be 10%?

Question 396896: How many cups of pure granola must be added to 16 cups of granola that is 15% raisins so that the percent of raisins in the resulting mixture will be 10%?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How many cups of pure granola must be added to 16 cups of granola that is 15% raisins so that the percent of raisins in the resulting mixture will be 10%?
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Equations:
raisins + raisins = raisins
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0*x + 0.15*16 = 0.10(x+16)
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Multiply thru by 100 to get:
0 + 15*16 = 10x + 10*16
10x = 5*16
x = 8 cups (amt. of pure granola needed for the mixture)
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Cheers,
Stan H.
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