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
$$3(4+a)=2(9+a)$$ $$12+3a=18+2a$$ $$a=6$$
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