Question

if 21 y 5 is multiple of 9, where y is a digit what is the value of y​

Answer 1

Answer:

least value of y is 1

y= 1 , 4,7

Answer 2

Answer:

21y5 is completely divisible by 9

acc. to divisiblity test of 9 the sum of the digits in the number must be divisible by 9.

2+1+y+5

8 +y

closest number in 9's table = 9

8+y = 9

9-8 = y

1 = y