Question

If 21y 5 is a multiple of 9 where y os a digit what os the value of y

Answer 1

Here is your answer. I hope it is helpful to you.
y=9÷(5×21)=3/35

Answer 2

Hy..
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THANKYOU YOU ASKING.
QUESTION
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HERE YOUR ANSWER
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The sum of digits of a multiple of 9 must be equal to 9 .

2+1+y+5 = 9
y = 9-2-1-5
y=1
The value of y = 1

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