Question

Find all possible values of z for which the number 51z3 is divisible by 9.

Answer 1

Here is your answer.

theory:
For a number to be divisible by 9 the sum of all the digit should be divisible by 9

solution:

5+1+z+3 should be divisible by 9
9+z should be divisible by 9
so this implies z is 0,9
as 0+9 and 9+9 ie 9,18 is divisible by 9

answer: z=0,9

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Answer 2

o,and 9 are the values of z for number 51z3 is divisible by 9.
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