Solve for R
R = \frac{15}{8} = 1\frac{7}{8} = 1.875
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15R\times \frac{1}{5}+15R\times \frac{1}{3}=15
Variable R cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 15R, the least common multiple of 5,3,R.
\frac{15}{5}R+15R\times \frac{1}{3}=15
Multiply 15 and \frac{1}{5} to get \frac{15}{5}.
3R+15R\times \frac{1}{3}=15
Divide 15 by 5 to get 3.
3R+\frac{15}{3}R=15
Multiply 15 and \frac{1}{3} to get \frac{15}{3}.
3R+5R=15
Divide 15 by 3 to get 5.
8R=15
Combine 3R and 5R to get 8R.
R=\frac{15}{8}
Divide both sides by 8.
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