The ratio of two numbers is 4:5 and their LCM is 60 then their HCF is

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Solution

The correct option is B 3
Let the numbers be 4x, 5x
Then, their L.C.M. = 20 x.
So, 20 x = 60 or x = 3.
The numbers are $4 \times 3 = 12, 5 \times 3 = 15$
Then H.C.F =3

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