Problems on HCF and LCM - General Aptitude

Q1:

Find the highest common factor of 36 and 84.

A 4

B 6

C 12

D 18

ANS:C - 12

36 = 22 x 32 84 = 22 x 3 x 7  H.C.F. = 22 x 3 = 12.