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Two numbers are in the ratio 3 ∶ 5. If each number is increased by 10, the ratio becomes 5 ∶ 7. The smaller number is∶
- A8
- B12
- C15
- D18
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CCommunity
Two numbers are in the ratio 3 ? 5,
Let the numbers be 3x and 5x,
Each number is increased by 10, and the ratio becomes 5 ? 7,
⇒ (3x + 10)/(5x + 10) = 5/7
⇒ x = 5
∴ Smallest number, 3x = 15
Let the numbers be 3x and 5x,
Each number is increased by 10, and the ratio becomes 5 ? 7,
⇒ (3x + 10)/(5x + 10) = 5/7
⇒ x = 5
∴ Smallest number, 3x = 15