A photo exhibition will be held in grade two. If each class has to fold 5 photos, how many photos will six classes fold?

Children should use their brains when doing their homework. Although they can find the answer here, they won't regret it during the exam.

Choose five cards for each category, that is, five cards for one category, five cards for two categories, five cards for three categories, five cards for four categories, five cards for five categories and five cards for six categories. How many cards are there in total? Five cards are X6=30.