Question

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

Answer 1

Answer:

1

Step-by-step explanation:

2+1+y+5 = multiple of 9

8+y= multiple of 9

the nearest number is 9 so if we add substitute 1 instead of y we get: 2+1+1+5 = multiple of nine (9)

so 2115 is a multiple of 9