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0.6 of a number equals 0.09 of another number. The ratio of the number is?

2 : 3
1 : 15
20 : 3
3 : 20

Correct Answer: 3 : 20

Explanation:

0.6 x a = 0.09 x b
∴ a/b = 0.09 / 0.06 = 9 / 60 = 3 / 20 = 3 : 20

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