# Solve for r 4/r=5/20

4r=520
Cancel the common factor of 5 and 20.
Factor 5 out of 5.
4r=5(1)20
Cancel the common factors.
Factor 5 out of 20.
4r=5⋅15⋅4
Cancel the common factor.
4r=5⋅15⋅4
Rewrite the expression.
4r=14
4r=14
4r=14
Multiply the numerator of the first fraction by the denominator of the second fraction. Set this equal to the product of the denominator of the first fraction and the numerator of the second fraction.
4⋅4=r⋅1
Solve the equation for r.
Rewrite the equation as r⋅1=4⋅4.
r⋅1=4⋅4
Multiply r by 1.
r=4⋅4
Multiply 4 by 4.
r=16
r=16
Solve for r 4/r=5/20

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