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Problems on HCF and LCM - General Aptitude

Q1:

Which of the following fraction is the largest ?

A
7
8

B
13
16

C
31
40

D
63
80

ANS:A -

7
8

L.C.M. of 8, 16, 40 and 80 = 80.

7 = 70 ;   13 = 65 ;   31 = 62
8 80 16 80 40 80
Since, 70 > 65 > 63 > 62 , so 7 > 13 > 63 > 31
80 80 80 80 8 16 80 40
So, 7 is the largest.
8