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Linear Equations in Two Variables

SAT Math· difficulty 3/5

A 6% milk fat solution mixed with 1% milk fat. To get 10 L at 4%, how much 6% milk is needed?

  • A

    55 L

  • B

    66 L

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  • C

    33 L

  • D

    44 L

Explanation

0.06x+0.01(10−x)=0.04(10)⇒0.05x+0.10=0.40⇒x=60.06x + 0.01(10 - x) = 0.04(10) \Rightarrow 0.05x + 0.10 = 0.40 \Rightarrow x = 6.

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