Answer:
He needs 3 packs of hot dogs and 2 packs of hot dog buns. He has 4 hot dogs and 4 hot dog buns left over.
Explanation:
Because 8 x 3 = 24 and 12 x 2 = 24
But since he needs enough for 20 people he would have 4 hot dogs and 4 hot dog buns leftover.