Question
One textbook costs $20 at a shop. During a sale, for every 6 textbooks bought, the 7th textbook can be bought at a discount of 20% off the original price. How many textbooks does Ken buy if he pays $372 altogether?
4 m

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One textbook costs $20 at a shop. During a sale, for every 6 textbooks bought, the 7th textbook can be bought at a discount of 20% off the original price. How many textbooks does Ken buy if he pays $372 altogether?