Question

If 21 y 4 is a multiple of 9 where
y is a digit. what is the value of y​

Answer 1

Answer:

y value Matlab............

Answer 2

Answer:

y = 2

Step-by-step explanation:

For a number to be divisible by 9 , its digits sum must be 9 or a multiple of 9.

∴ In number 21y4 ,

2 + 1 + y + 4 = 9

∴ y + 7 = 9

∴ y = 2

If sum of digits in 21y4 is taken as 18 i.e. , 9×2 ,

y will not remain a digit .

∴ y = 2