Question

the smallest number from which if 4000 substacted, is exactly divisible by 7, 11and 13 is?

Answer 1

u mean find n
s.t
4000-n | 7*11*13 ?

Answer 2

Since 7, 11, and 13 are relatively prime, meaning they have no common factors, the number must be divisible by (7)(11)(13)=1001.

@ikram002p I think you mean n-4000, since it is the number from which 4000 is subtracted.