Q. 5

If 4xy7 is exactly divisible by 3, then the least value of (x + y) isA. 1B. 4C. 5D. 7

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

Here,

4 + x + y + 7 = multiple of 3

x + y + 11 = 0, 3, 6, 9, ….

Hence,

x + y + 11 = 12

x + y = 1

the least value of (x + y) is 1

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