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Question

Two numbers are in the ratio 4:5 and their L.C.M. is 180. Find the smaller number.

A
8
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B
15
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C
36
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D
45
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Solution

The correct option is B 36
Let the numbers be 4x and 5x
Now L.C.M of 4x and 5x=4×5×x=20x
Given, 20x=180x=9
Smaller number =4 × 9=36

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