Question

The number X is 3 times of the number Y. 48 is a common multiple of number X and
number Y. What is the number X?
b) 8
d) 24
c) 9
(ISFO Olympiad, 2019-2​

Answer 1

Answer:

X=3Y

if X=8, =>Y=24.

8×6=48,24×2=48

if X=24, =>Y=72

But 72>48 so 48 is not multiple of 72

so, X≠24

if X=9, =>Y=27

But 48 is not multiple of 27

so, X≠9

do, option 1 is correct