Question

if 31y52 is a multiple of 9 where y is a digit then find the value of y​

Answer 1

Answer:

For our given problem 21y5 is multiple of 9. This means 21y5 is divisible by 9. So, the sum of the digits of 21y5 has to be divisible by 9. This means 2+1+y+5=y+8 is divisible by 9.

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