Question

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

Answer 1

Answer:

If 21y5 is a multiple of 9, where y is a digit, what is the value of y? Solution : For a number to be a multiple of 9, sum of all of its digits should be divisible by 9. So, (8+y) should be divisible by 9 if value of y is 1.

Answer 2

Answer:

property

if a number should be divisible by 9 then the sum of the digit must be divisible by 9

according to property

2+1+y+5= multiple of 9

8+y=9(suppose,becausey must be 1 digit)

therefore y=1