Question

if the 8 digit number 136x 85785 is divisible by 15 then find the least possible value of x

Answer 1

the least possible no is 2
bcz the given no have to be divisible by 3 and 5 as to be divisible by 15.
so the no is divisible by 5 as it has 5 at its one's place.
now the sum of all digits of the no is 43 and if 2 is added then it will be 45 and it is divisible by 3 according to divisibility test of 3.

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