SOLUTION: I have made 60 cupcakes. 36 are chocolate and 24 are vanilla. How many more chocolate do I need to make to have 70% of the cupcakes be chocolate. Please show the proportion used

Question 741256: I have made 60 cupcakes. 36 are chocolate and 24 are vanilla. How many more chocolate do I need to make to have 70% of the cupcakes be chocolate. Please show the proportion used.

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
I have made 60 cupcakes. 36 are chocolate and 24 are vanilla. How many more chocolate do I need to make to have 70% of the cupcakes be chocolate. Please show the proportion used.
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Proportion:
(# of chocolate)/(total # of cupcakes) = 70/100
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(36+x)/(60+x) = 70/100
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36*100 + 100x = 70*60 + 70x
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30x = 600
x = 20 (# of chocolate to add)
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Cheers,
Stan H.
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