2009 AMC 10A Problem 7

Problem 7 of 25EasierAlgebra

A carton contains milk that is

2\%

fat, an amount that is

40\%

less fat than the amount contained in a carton of whole milk. What is the percentage of fat in whole milk?

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Solution

Let whole milk be

x\%

fat. Since

2

40\%

less than

x,

we have

0.6x = 2,

x = \dfrac{2}{0.6} = \dfrac{10}{3}.

Thus, the correct answer is C.

Concepts: percentage · linear equation

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