SOLUTION: How many ounces of pure chocolate must be added to 220 ounces of chocolate topping that is 50% chocolate to make a topping that is 75% chocolate?

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Question 352130: How many ounces of pure chocolate must be added to 220 ounces of chocolate topping that is 50% chocolate to make a topping that is 75% chocolate?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How many ounces of pure chocolate must be added to 220 ounces of chocolate topping that is 50% chocolate to make a topping that is 75% chocolate?
.
Let x = amount (ounces) pf pure chocolate to add
then
x + .50(220) = .75(220+x)
x + 110 = 165 + .75x
.25x + 110 = 165
.25x = 55
x = 220 ounces