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You have $$10$$ pieces of chocolate with you. $$4$$ of your friends see you with the chocolates. Naturally, they also want some chocolate! You give each of them $$1$$ piece of chocolate.
In total, how many pieces of chocolate are there (with you and your friends) before and after you give them the chocolates?
• Before: $$10$$; After: 6
• Before: $$10$$; After: $$4$$
• Before: $$10$$; After: $$10$$