31z5 is amultiple of 3. Find the value of z.

Dear student,
You can split number 31z5 as
31Z5=3000 + 100 + Z0 + 5
Now we have to split this digits such that all the numbers are multiple of 3
3000(already a multiple of 3) + (100-1=99) multiple of 3 +Z0 (need to be multiple of 3) + (5+1)multiple  of 3
so now we just need to check for Z0
Z0 will be multiple of 3 only if Z is multiple of 3.
So, possible values of Z will be 0,3,6,9

Hope this helps you.

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