Question

If 31z5 is a multiple of 3,where z is a digit,ehat might be the value of z??

Answer 1

31z5 is a multiple of 3

So it is also divisible by 3

Using divisibility method

3+1+z+5/3

=9+z/3

= 9+3/3 ( to make divisible by 3 we need to add 3 in place of z)

Z= 3