Linear Equations in Two Variables

SAT Math· difficulty 4/5

A nurse mixes a 5% glucose with a 25% glucose solution. To make 200 mL of 10% glucose, how much 25% is used?

A
$30$
B
$60$
C
$50$
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D
$40$

Explanation

0.05(200 - x) + 0.25x = 0.10(200) \Rightarrow 10 + 0.20x = 20 \Rightarrow x = 50

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