Question

if 21y5 is a multiple of 9 ,where y is a digit ,what is the value of y?​

Answer 1

Answer:

If a number should be divisible by nine, then the sum of the digits must be divisible by nine. therefore y= 1 only.

Step-by-step explanation:

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Answer 2

Answer:

y=1

Step-by-step explanation:

21y5

For any number to be divisible by the sum of digits is divisible by 9

sum=2+1+y+5=8+y

8+y can be multiple of 9 if y=1

Then 2+1+y+5=3+1+5=9

Hence y=1