Question 980711
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x=number of grams to sell at one peso
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(0.75 pesos/g)(15 grams)+(1 peso/g)(x grams)=(0.85 pesos/g)(x+15 grams)
(0.75)(15)+ x=(0.85x)+(0.85)(15) Subtract (0.85x+(0.75)(15)) from each side.
0.15x=(0.10)(15) Divide each side by 0.15.
x=10 ANSWER: He must sell 10 grams at 1 peso.
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CHECK:
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(0.75 pesos/g)15g+(1peso/g)10g=(0.85 pesos/g)25g
(11.25 pesos)+(10 pesos)=21.25 pesos
21.25 pesos=21.25 pesos