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Three number are in the ratio 3 :4 : 5 . The sum of the largest and the smallest equals the sum of the third and 52. The smallest number is?

20
27
39
52

Correct Answer: 39

Explanation:

Let the numbers be 3N, 4N and 5N.
Then, 5N + 3N = 4N + 52
⇒ 4N = 52
⇒ N = 13
∴ Then smallest number = 3N = 3 x13 = 39.

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