What is the answer to 12/20 = 3/x ?

The answer to 12/20 = 3/x is x=5

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12/20 = 3/x

\frac{12}{20} = \frac{3}{x}

x = 5

Solution steps

\frac{12}{20} = \frac{3}{x}

Cross multiply

12 x = 60

Divide both sides by

12

x = 5

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 5

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

\frac{3 x}{x + 1} = 9 - \frac{3}{x + 1}

\frac{4}{x - 2} = 5

\frac{3}{x} = \frac{18}{9.7}

\frac{5}{r + 10} = \frac{7}{5}