SOLUTION: how much coffee consisting 75 pesos per 100 grams should be added to 250 grams of coffee costing 250 pesos in order to produce 80 pesos per 100 grams

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Question 741639: how much coffee consisting 75 pesos per 100 grams should be added to 250 grams of coffee costing 250 pesos in order to produce 80 pesos per 100 grams
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
p = amount, grams of coffee at 75 peso per 100 grams to use.
(Total Cost) / (total grams) = (target pesos) / (target grams)

%28p%2A%2875%2F100%29%2B250%2A%28250%2F250%29%29%2F%28p%2B250%29=80%2F100

%280.75p%2B250%29%2F%28p%2B250%29=0.80

0.75p%2B250=0.80%28p%2B250%29
0.75p%2B250=0.80p%2B0.80%2A250
0.75p%2B250=0.80p%2B200
50=0.05p
p=50%2F%280.05%29
p=1000__grams