jill has contest cards of 3,9,12,15,18,27,51,72,84 she must have a total of 100 find the right combo?

Question

how can the contest be structurted so there would be at most 1000 winners country wide

Answer 1

All the contest cards have numbers that are multiples of three. So the sum total for any combination of cards will also be a multiple of three. 100 is not divisible by three. So no combination of contest cards can total 100.