What is the answer to 4/x = 2/5 ?

The answer to 4/x = 2/5 is x=10

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4/x = 2/5

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

x = 10

Solution steps

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

Cross multiply

20 = x \cdot 2

Switch sides

x \cdot 2 = 20

Divide both sides by

2

x = 10

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 10

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

\frac{( x + 3 )}{x} = \frac{2}{5}

\frac{4}{x + 10} = \frac{4}{x - 3}

\frac{3}{x} + 2 = \frac{4}{5 x}

4 = b^{- 2}