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It's a trick question and an impossible sum. First you have to convert the number into millimetres, and the percentage into a fraction. So we now have one tenth of 900 millimetres. If you have a 12 inch ruler, you wil see that 900 millimetres isn't on it. Erego, ten one hundredthsof 900 is still 90, leaving you with the same amount you started with.
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