Billy's toffees

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Billy is given some toffees by his father. He eats one and then shares the rest out equally between himself and Emily. He then eats another and then shares the rest out equally between himself and Detti. He eats one more and gives the last one to Sean.


How many toffees did Detti get?


How many toffees did Emily get?


How many toffees did Billy have at the start?

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