Question

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

Answer 1

Answer:

y=1

Step-by-step explanation:

2+1+y+5 is a multiple of 9

so we can write,

2+1+y+5=9(for just find)

8+y=9

y=9-8

y=1