Question

Pepperidge Farm Goldfish is a snack food for which 40% of it's calories come from fat. Rold Gold Pretzels receive 9% of their calories from fat. How many grams of each would be needed to make 620 g of a snack mix for which 15% of the calories are from fat?​

Answer 1

Let x = grams of goldfish
the
620-x = grams of roll gold
.
.40x + .09(620-x) = .15(620)
.40x + 55.8 - .09x = 93
.40x + 55.8 - .09x = 93
.31x + 55.8 = 93
.31x = 37.2
x = 120 grams of goldfish
.
roll gold:
620-x = 620-120 = 500 grams of roll gold