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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.

If exactly £3.90 was spent on some 24p and some 18p stamps, how many of each are there? (There is more than one answer)

Answer: 14x24 + 3x18 or 11x24 + 7x18 or 8x24 + 11x18 or 5x24 + 15x18 or 2x24 + 19x18