Homework Help: Algebra

Posted by sherry on Thursday, March 22, 2012 at 9:13am.

Pepperidge Farm Goldfish is a snackfood for which 40% of its calories come from fat. Rold Gold Pretzels recieve 9% of their calories from fat.How many grams of each would be needed to make 620g of a snack mix for which 15% of the calories come from fat?

Algebra - Reiny, Thursday, March 22, 2012 at 10:14am
let the amount of goldfish needed by x g
then the amount of pretzels needed is 620-x g

.4x + .09(620-x) = .15(620)
times 100
40x + 9(620-x) = 15(620)
40x - 5580 - 9x = 9300
31x = 14880
x = 480

Needed: 480 g of goldfish, and 140 g of pretzels

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