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If the LCM of 12 and 42 is 10m +4, then the value of m is

LCM(12,42) = 84

10m + 4 = LCM(12,42)

Therefore, 10m + 4 = 84

10m = 84 - 4

m = 80/10

m = 8 ans.

Thank you! i hope this helps.

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a = 12

b = 42

HC of 12 n 42 is given by

12 = 2 X 2 X 3

42 = 2 X 3 X 7

HCF (12,42) = 2

LCM (12,42) = 2 X 2 X 3 X 7

= 4 X 21

= 84

= 80 + 4

= 10 X 8 +4

On comparing, m = 8

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