Solve for r
r = \frac{25}{2} = 12\frac{1}{2} = 12.5
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r=10\times \frac{5}{4}
Multiply both sides by \frac{5}{4}, the reciprocal of \frac{4}{5}.
r=\frac{10\times 5}{4}
Express 10\times \frac{5}{4} as a single fraction.
r=\frac{50}{4}
Multiply 10 and 5 to get 50.
r=\frac{25}{2}
Reduce the fraction \frac{50}{4} to lowest terms by extracting and canceling out 2.
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