The ratio between two numbers is 3 : 4 and their L.C.M. is 180. The first number is?

15
20
45
60

Correct Answer: 45

Explanation:

Let the numbers be 3x and 4x
Then, their L.C.M. = 12x
⇒ 12x = 180
∴ x = 15
Hence, the first number = 45

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