Answer: (2) 4: 3

Explanation:-
If 15% of X is same as 20% of Y,
Then, X x 15/100 = Y x 20/100
15 X = 20 Y
3 X = 4 Y
X/Y = 4/3
Then, the X: Y = 4: 3.

Hence, the answer is (2) 4: 3.