Question

If 3x12 is a multiple of 3 and x is digit, then find the value of x
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Answer 1

3+3+1+2=9

3x3=9

3+6+1+2=12

3x4=12

3+9+1+2=15

3x5=15

Divisibility rule of 3 is:

Add up all the digits of the given number,

It should be a multiple of 3,

If the sum of all the digits is a multiple of 3 then the number itself is a multiple of 3 or is divisible by 3.

so X can either be 3 or 6 or 9.

Answer 2

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