SOLUTION: how many pounds of pure chocolate must be added to 20 pounds of brownie dough that is 30% chocolate to produce a brownie mixture that is 50% chocolate?

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Question 278193: how many pounds of pure chocolate must be added to 20 pounds of brownie dough that is 30% chocolate to produce a brownie mixture that is 50% chocolate?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many pounds of pure chocolate must be added to 20 pounds of brownie dough that is 30% chocolate to produce a brownie mixture that is 50% chocolate?
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One variable Solution:
chocolate + chocolate = chocolate:
0.30*20 + 1.00x = 0.50(20+x)
Multiply thru by 100 to get:
30*20 + 100x = 50*20 + 50x
50x = 20*20
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x = 8 lbs (amt. of pure chocolate that must be added to the mixture)
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Cheers,
Stan H.