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Making assumptions you only need the 1st clue

I could not work out how clue 2 helped at all. You don't know the house number the agent calls at or next door...

a+ b + c = n is all very good, but only confuses the issue by adding a 4th unknown. So I ignored it.

There are 3 possible answers, but assuming the 3 children are all different ages & being told they are all whole numbers, it leaves 1 possible answer.

I won't spoil it for anyone else but would like to know if I'm correct & if all 3 clues were used.

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