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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

Two farmers are on their way to market to sell their sheep. One says to the other \"Sell me one of your sheep and then we will have the same number\" to which the other replies, \"No, you sell me one of yours and then I will have twice as many as you\". How many sheep did each farmer have?

Answer: 5 and 7