ACT 2009 April(66F) Math Question 12 Explanation - ACT Helper

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2009 April(66F) Math Question 12
Ratios, Proportions, Percentages, Fractions
- LCM, GCF, Prime Numbers
Choice J
$30 = 3 \times 10$ $20 = 2 \times 10$ $70 = 7 \times 10$ $[30, 20, 70] = 2 \times 3 \times 7 \times 10 = 420$
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