SOLUTION: I have a problem that I need help with if possible. How many ounces of pure chocolate must be added to 120 ounces of chocolate topping that is 50% chocolate to make a topping that

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Question 722556: I have a problem that I need help with if possible. How many ounces of pure chocolate must be added to 120 ounces of chocolate topping that is 50% chocolate to make a topping that is 70% chocolate?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
How much of pure matter must be added to 120 units of mixture that is 50% matter to make a mixture that is 70% of this matter?

Let y = pure matter to add
highlight%28%28120%2A0.50%2By%29%2F%28120%2By%29=0.70%29, and solve for y.