Question

If x and y are the two digits of the number 653xy such that this number is divisible by 80, then x + y = ______ .

• A. 6
• B. 4
• C. 8
• D. 4 or 8

Answer 1

The correct option is A

6

We have

$80=2\times 5\times 8$

Since 653xy is divisible by 2 and 5 both, so y = 0.

Now, 653x is divisible by 8, so 53x should be divisible by 8.

This happens when x