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2015-09-02T20:00:14+08:00

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N= 21..
checking:
9/15=21/35
in order to check your answer you have to cross multiply it.. if the answers are equal it means that the answer is correct..

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2015-09-02T20:22:35+08:00

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N=21 just cross multiply the 9&35 and divide it on 15
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