A line has a rise of 6 and a slope of 1/20 what's the run

Slope = rise / run

slope = 1/20

rise = 6

now sub

1/20 = 6 / run (r) ... now u cross multiply because this is a proportion

(1) (r) = (6) (20)

r = 120 <==the run

* * and take notice ... proportions are nothing but equivalent fractions

1/20 = 6/120