If 21y5 is a multiple of 9, where y is a digit, which digits can take the possible value of y?

If 21y5 is a multiple of 9, where y is a digit, which digits can take

1.	If 21y5 is a multiple of 9, where y is a digit, which digits can take the possible value of y?
Answer» If 21y5 is a multiple of 9, where y is a digit, which digits can take the possible value of y?