Question

Billy has both baseball and football card collections. He arranges his cards in equal rows. Using his current card collection, Billy is able to make rows of 9 cards, with each row containing only one type of card. Select all the ways that Billy can have each type of card in his collection.

Answer 1

If he has 9 rows and has 2 of each type. Then he has 9 rows of two columbs. so 18 cards.