SOLUTION: How many ounces of pure bran flakes must be added to 60 oz of cereal that is 20% bran flakes to produce a mixture that is 40% bran flakes?

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Question 363187: How many ounces of pure bran flakes must be added to 60 oz of cereal that is 20% bran flakes to produce a mixture that is 40% bran flakes?
Found 2 solutions by stanbon, ewatrrr:
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
How many ounces of pure bran flakes must be added to 60 oz of cereal that is 20% bran flakes to produce a mixture that is 40% bran flakes?
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Equation:
bran + bran = bran
0.20*60 + 1.00x = 0.40(60+x)
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Multiply thru by 100 to get:
20*60 + 100x = 40*60 + 40x
60x = 20*60
x = 20 ounces (amt. of pure bran needed in the mixture)
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Cheers,
Stan H.
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!


Hi, 

 

Let x represent the amount of pure bran flakes (an 100% solution)

.20*60oz + 1.00x = .40(60oz + x)

solving for x

.60x = .20*60oz

x = 20oz of oure bran flakes need to be added



checking our answer

12 + 20 = .40*80 = 32 

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