Question

if 21 y5 is a multiple of 9 where Y is a digit what is the value of Y?

Answer 1

we know if 21y5 is a multiple of 9...then sum of digits of 21y5 divisible by 9....
hence 2+1+y+5=8+y
y should be 1.... then 8+1=9 which is divisible by 9
I think you got ur answer.

if you like it...mark as brainliest

Answer 2

${\huge{\bf{\color{lavender}{Answer}}}}$

• For 21 y5 to be divisible by 9.

Sum of the digits 2 + 1 + y + 5 should be divisible by 9.

$\implies$8 + y should be divisible by 9.

Thus,8 + y can be 0,9,18,27.

• Since y is a single digit in the tens place,8 + y can be 9.

$\implies$y = 1.