Question

If 21y8is a multiple of 9 then find y.​

Answer 1

Answer:

Property: If a number should be divisible by nine, then the sum of the digits must be divisible by nine. therefore y= 1 only. Hope my answer helps you.

Step-by-step explanation:

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Answer 2

Heya

See, if we want to know if a number is divisible by 9, we add all the digits , if the sum is a multiple of 9, the whole number is a multiple oh 9.

So here,

2+1+y+8 = a multiple of 9

11+y= a multiple of 9

Now, the least number we can add to get a multiple of 9 is 7, therefore, 11+7 is 18 which is a multiple of 9.

Hence, y = 7

Hope this helps :)