exam Maths Puzzle Numerical Ability

14a2-15a+4

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solve each system by graphing.
y=-1
y=5/2x+4 A certain creme mixture contains 12 grams of creme A, 18.6 grams of petrolatum, and 30 grams univase. The pharmacist needs to make a 480-gram mixture containing the same ratio of ingredients. How much of each ingredient should she include?