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Question

Three numbers are in the ratio of 3:4:5 and their L.C.M. is 2400. Their H.C.F. is

A
20
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B
80
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C
40
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D
60
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Solution

The correct option is C 40
Let the numbers be 3x,4x and 5x.
Then, clearly, H.C.F.=x
and L.C.M.=60x
60x=2400
x=40

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