Mathematical Reasoning第 65 / 120 题
A number increased by 20% becomes 60. What was the original number?
a.50
b.48
c.40
d.72
解析
If the original number is x, then 1.20x = 60, so x = 60 ÷ 1.20 = 50. Increasing by 20% multiplies by 1.20. Reversing the increase means dividing by 1.20.
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