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Q.

Three numbers are in the ratio 2 : 3 : 4 and their L.C.M is 240. Find the middle number.

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a

45

b

36

c

30

d

60

answer is D.

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Detailed Solution

Let the numbers be 2x, 3x, 4x

LCM of 3 numbers =240=12x

240=12x

20=x

Middle  number=3x=3×20=60

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