Question

if 15a is divisible by 9 find the value of a

Answer 1

3,can be the value of a

Answer 2

if 15a is divisible by 9 then the value of 'a' should be 
{divisibility of 9 is sum of all the digits of the number is divisible by 9 }

so, 1+5+a = 6+a =
      if we put a = 3, then
      6+a =6+3 =9  and
      9 is divisible by 9 

so, the value of 'a' is 3.

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