What is the answer to 3/5 = 9/x ?

The answer to 3/5 = 9/x is x=15

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3/5 = 9/x

\frac{3}{5} = \frac{9}{x}

x = 15

Solution steps

\frac{3}{5} = \frac{9}{x}

Cross multiply

3 x = 45

Divide both sides by

3

x = 15

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 15

\frac{2 x - 1}{x + 2} = \frac{8}{7}

\frac{1}{x - 9} - 1 = \frac{x}{x - 9}

- \frac{3}{4} = \frac{9}{x}

\frac{2 π}{b} = π

\frac{1 - 4 x}{3 x - 2} = \frac{2}{3}