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09-02-2015
Mathematics

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3/7 of what number is 9?

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09-02-2015

x - the number

[tex]\frac{3}{7}x=9 \\ x=9 \times \frac{7}{3} \\ x=3 \times 7 \\ x=21[/tex]

3/7 of 21 is 9.

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