Question

If 7xy4 is exactly divisible by 9 , then the least value of (x+y) is ____​

Answer 1

Answer:

For example

Step-by-step explanation:

Divisibility law of 9 ⇒ A number is divisible by 9 if sum of its digit is divisible by 9.

If the number 687x29 is divisible by 9, then

6 + 8 + 7 + x + 2 + 9

⇒ 32 + x

If we put x = 4, so that number become divided by 9.

32 + 4

⇒ 36

Now,

2x

⇒ 2 × 4

⇒ 8