SOLUTION: An advertisement for grape drink claims that the drink contains 10% grape juice. How much pure grape juice would have to be added to 5 quarts of the drink to obtain a mixture of 40

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Question 213560This question is from textbook
: An advertisement for grape drink claims that the drink contains 10% grape juice. How much pure grape juice would have to be added to 5 quarts of the drink to obtain a mixture of 40% grape juice?This question is from textbook

Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
.10*5+X=.4(5+X)
.5+X=2+.4X
X-.4X=2-.5
.6X=1.5
X=1.5/.6
X=2.5 QTS. OF PURE GRAPE JUICE IS USED.
PROOF:
.10*5+2.5=.4(5+2.5)
.5+2.5=.4*7.5
3=3