Question

If 21y8 is a multiple of 6, then find the value of y?

Answer 1

solution:

the sum of digits of 6 must be equal to 6.

therefore,

2+1+y+8=6

y=6-11

= -5

Answer 2

solution:

the sum of digits of 6 must be equal to 6.

therefore,

2+1+y+8=6

y=6-11

= -5