Question

If 18x5 is a multiple of 9, where x is a digit, what is the value of x?

Answer 1

Given that,

If 18x5 is a multiple of 9.

Where, x is a digit.

We know that,

The divisibility condition for 9 is that the sum of the digits must be 9 or a multiple of 9.

We need to calculate the value of x

Using formula for divisibility

$1+8+x+5=9+9$

$14+x=18$

$x=18-14$

$x=4$

Hence, The value of x is 4.