9 From 6, 10 From 9 And 50 From 40

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Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

How is this possible?

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SIX – 9 (IX) = S 9 (IX) – 10 (X) = I 40 (XL) – 50 (L) = X The answer is therefore SIX. (strange logic for this one) 🙂

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