I have seven bags. Three bags are big, and the other four bags are small. I have some basketballs and volleyballs. I put two volleyballs in each small bag. And I put two basketballs and two volleyballs in each big bag. The number of the volleyballs is my age. What's in those big bags ?
Two basketballs and six volleyballs. Eight basketballs and six volleyballs. Six basketballs and six volleyballs. Eight basketballs and eight volleyballs.