Question

I want to know how do I find the value of n for number 4.

Answer 1

The values of miles and hours are proportional. Then,

`(45)/(4)=(135)/(n)`

To find n, multiply both sides by 4n.

`\begin{gathered} (45\cdot4n)/(4)=(135\cdot4n)/(n) \\ 45n=540 \end{gathered}`

Now, divide both sides by 45:

`\begin{gathered} (45n)/(45)=(540)/(45) \\ n=12 \end{gathered}`

Answer: n = 12.