SajjadAhmad wrote:

If a mixture of ground meat consists of 2 pounds of veal that costs x dollars per pound, and 5 pounds of beef that costs y dollars per pound, what is the cost, in dollars, per pound of the mixture?

(A) 2x + 5y

(B) (2x + 5y)/xy

(C) 5(2x + 5y)

(D) x + y

(E) (2x + 5y)/7

Since the options have variables, you can plug in some values to get the answer. The values that come immediately to mind are x = 1 and y = 1 i.e. if the cost of both meats is $1 per pound, the cost of the mix would be $1 per pound too.

We see immediately that only (E) gives 1 so it will be the answer.

Or just use the weighted average formula

Cavg = (C1*w1 + C2*w2)/(w1 + w2) = (x * 2 + y * 5)/(2 + 5) = (2x + 5y)/7

Answer (E)

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Karishma

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