What is the answer to 15/4 = 9/(2r) ?

The answer to 15/4 = 9/(2r) is r= 6/5

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15/4 = 9/(2r)

\frac{15}{4} = \frac{9}{2 r}

r = \frac{6}{5}

Decimal Notation

r = 1.2

Solution steps

\frac{15}{4} = \frac{9}{2 r}

Cross multiply

30 r = 36

Divide both sides by

30

r = \frac{6}{5}

Verify Solutions

Find undefined (singularity) points:

r = 0

Combine undefined points with solutions:

r = \frac{6}{5}

\frac{12 - 4}{5 ( x + 15 )} = 8

\frac{1 - 2 x}{x + 7} = \frac{x}{x - 1}

4 - \frac{5}{y} = \frac{7}{y}

\frac{399}{2 - 4 x} = 694

\frac{1}{3 ( 6 x + 12 ) - 2 ( x - 7 )} = 19