Answer :

We know that if sum of digits of a number is divisible by 3, then the number is divisible by 3.


Here,


x + 7 + y + 5 = multiple of 3


x + y + 12 = 0, 3, 6, 9, ….


Hence,


x + y + 12 = 12


x + y = 0


But x + y cannot be 0 because then x and y both will have to be 0.
Since x is the first digit, it cannot be 0.
x + y + 12 = 15


x + y = 3


the least value of (x + y) is 3

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