Here it’s given 213x27 is divisible by 9,where x is a digit. As this number 213x27 is divisible by 9, then when we sum up the digits of this number it should be a multiple of 9.
So, when we add all the digits, of the number 213x27,we get
2 + 1 + 3 + x + 2 + 7 = 15 + x.
Then 15x should be equal to any multiple of 9.i.e.9,18,27,etc
When a number is divisible by 9 then when we sum up the digits of that number it results in a multiple of 9.
Here, lets assume 15 + x = 18
⇒ x = 3
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