What is the answer to 2/5 = 8/x ?

The answer to 2/5 = 8/x is x=20

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2/5 = 8/x

\frac{2}{5} = \frac{8}{x}

x = 20

Solution steps

\frac{2}{5} = \frac{8}{x}

Cross multiply

2 x = 40

Divide both sides by

2

x = 20

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 20

\frac{3}{3 b + 5} = \frac{2}{b - 5}

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

\frac{24}{x} = 0

\frac{x ^{2} - 9}{x + 3} = x^{2} - 15

\frac{1}{x} + \frac{1}{3 x} = 4