The Puzzle of A Deal in Apples

I paid a man a shilling for some apples, but they were so small that I made him throw in two extra apples.

I find that made them cost just a penny a dozen less than the first price he asked.

How many apples did I get for my shilling?

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1. The Puzzle of Market Women
2. The Square Money Puzzle
3. The Cyclists’ Feast Puzzle
4. Indiscriminate Charity Puzzle
5. The Two Aeroplanes Puzzle