Question

X is a 5 digit number when we subtract the sum of the digits form X, it becomes divisible by _____ A .5 B .1 C.9 D.6

Answer 1

let 5 digit no divisible by 9

so it's 9k

As sum of digits would also be divisible by 9

so it's 9 k'
now subtract 9k - 9k ' = 9(k-k')

As k - k' is integer

so it's divisible by 9