How many sides does a triangle have?

If you have 4 groups of 2 apples each, how many apples do you have in total?

If a triangle has sides of length 3, 4, and 5, what is its perimeter?

Sarah has 8 apples. She buys 5 more apples from the store. Then, she gives 4 apples to her friend. How many apples does Sarah have now?

Mike has 12 marbles. He finds 6 more under the couch and then loses 5 at the park. How many marbles does Mike have now?

Emily has 15 stickers. She gives 7 to her friend and then buys 3 more. How many stickers does Emily have now?

Sam has 40 comic books. He lends 15 to his friend and then buys 10 more. How many comic books does Sam have now?

Ben has 25 dinosaur toys. He gives 9 to his cousin and then buys 6 more from the toy store. How many dinosaur toys does Ben have now?