Solve for R
R=20
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4=R\times \frac{2.5}{12.5}
Variable R cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by R.
4=R\times \frac{25}{125}
Expand \frac{2.5}{12.5} by multiplying both numerator and the denominator by 10.
4=R\times \frac{1}{5}
Reduce the fraction \frac{25}{125} to lowest terms by extracting and canceling out 25.
R\times \frac{1}{5}=4
Swap sides so that all variable terms are on the left hand side.
R=4\times 5
Multiply both sides by 5, the reciprocal of \frac{1}{5}.
R=20
Multiply 4 and 5 to get 20.
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