Mathematics
Need help with my math i just don't get it.

### Question Description

3/7 of what number is 9?

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Let that unknown number be x.

$\frac{3}{7}\times x=9\\ \\ Multiply\hspace{5}both\hspace{5}sides\hspace{5}by\hspace{5}7\\ \\ \frac{3}{7}\times x\times7=9\times7\\ \\ 3x=63\\ \\ Divide\hspace{5}both\hspace{5}sides\hspace{5}by\hspace{5}3\\ \\ \frac{3x}{3}=\frac{63}{3}\\ \\ x=21$

So, the number is 21.

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shyamnair3 (279)
Boston College
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