SOLUTION: In her cupboard, Consuelo has some dark chocolate that is 70% cocoa solids and some milk chocolate that is 20% cocoa solids. How much of each kind should she use to obtain the desi

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: In her cupboard, Consuelo has some dark chocolate that is 70% cocoa solids and some milk chocolate that is 20% cocoa solids. How much of each kind should she use to obtain the desi      Log On

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Question 1186117: In her cupboard, Consuelo has some dark chocolate that is 70% cocoa solids and some milk chocolate that is 20% cocoa solids. How much of each kind should she use to obtain the desired mixture of 5 ounces that is 40% cocoa solids?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
p ounces of 70%
5-p ounces of 20%
5 ounces of mixture at 40%

highlight_green%2870p%2B20%285-p%29=40%2A5%29

70p-20p%2B20%2A5=40%2A5
%2870-20%29p=40%2A5-20%2A5
highlight_green%28p=5%28%2840-20%29%2F%2870-20%29%29%29---------simplify and compute,...
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2 ounces of 70% and 3 ounces of 20%