What is the answer to 27/81 = 3/r ?

The answer to 27/81 = 3/r is r=9

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27/81 = 3/r

\frac{27}{81} = \frac{3}{r}

r = 9

Solution steps

\frac{27}{81} = \frac{3}{r}

Cross multiply

27 r = 243

Divide both sides by

27

r = 9

Verify Solutions

Find undefined (singularity) points:

r = 0

Combine undefined points with solutions:

r = 9

\frac{8 x}{x - 3} - 3 = \frac{1}{x}

y, x = \frac{- y - 2}{y + 4}

\frac{6}{x + 1} = \frac{3}{x}

\frac{15}{x - 3} = \frac{10}{x}

\frac{16}{x} = 0.3