Question
One textbook costs $12 at a shop. During a sale, for every 6 textbooks bought, the 7th textbook can be bought at a discount of 25% off the original price. How many textbooks does Andy buy if he pays $291 altogether?
4 m

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One textbook costs $12 at a shop. During a sale, for every 6 textbooks bought, the 7th textbook can be bought at a discount of 25% off the original price. How many textbooks does Andy buy if he pays $291 altogether?