Question

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

Answer 1

Answer:

1

Step-by-step explanation:

The sum of all the digits of any multiple of 9 is = 9

For eg:- 27

2 + 7 = 9

Therefore, if 21y5 is a multiple of 9

2+1+y+5 = 9

=> 8+y=9

y=1

Answer 2

hi friend,

here is your answer

please follow me

Answer:

y = 1

If a number should be divisible by nine, then the sum of the digits must be divisible by nine. therefore y= 1 only.

Explanation:

2 + 1 + y + 5 = 9

8 + y = 9

y = 9 - 8

y = 1

hope it helps you and you understood

if helps please follow me