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If 30% of A equals 0.25 of B equals one-fifth of C, what is the ratio A : B : C?

1. 10 : 12 : 15
2. 5 : 6 : 8
3. 6 : 5 : 10
4. 15 : 12 : 10

Correct answer: 10 : 12 : 15

Solution

Setting 0.30A = 0.25B = 0.20C = k gives A:B:C = (1/0.3):(1/0.25):(1/0.2) = (10/3):4:5. Multiplying through by 3 yields 10:12:15.

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