What is the answer to 3/x = 5/15 ?

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

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3/x = 5/15

\frac{3}{x} = \frac{5}{15}

x = 9

Solution steps

\frac{3}{x} = \frac{5}{15}

Cross multiply

45 = x \cdot 5

Switch sides

x \cdot 5 = 45

Divide both sides by

5

x = 9

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 9

\frac{5}{6} = \frac{20}{x}

- 200 + \frac{12}{1 + x} = 0

\frac{3}{3 a + 4} = \frac{5}{5 a - 1}

(\frac{24}{x + 0.7}) = 4

\frac{6 - X}{X} = \frac{4}{X + 1}