Question

A gas pipeline has a grade of 1 inch to onefoot. If the line runs from the back wall ofthe shop 20 yards to the tank, what is thedrop?

Answer 1

The pipeline has a rate of 1 inch to one foot. 20 yards are equivalent to 20*3 = 60 ft. To find the drop (x) we can use the next proportion:

$\frac{1\text{ in}}{x\text{ in}}=\frac{20\text{ yards}}{60\text{ yards}}$

Solving for x:

$\begin{gathered} 1\cdot60=20\cdot x \\ \frac{60}{20}=x \\ 3\text{ in = x} \end{gathered}$

The drop is 3 inches