ACT 2012 June(70C) Math Question 9 Explanation - ACT Helper

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2012 June(70C) Math Question 9
Ratios, Proportions, Percentages, Fractions
- Proportions & Ratios
Choice D
$3 (4 + a) = 2 (9 + a)$ $12 + 3 a = 18 + 2 a$ $a = 6$
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