# The current temperature is 54^circ F. It is expected rise 2.5^circ F each hour. In how many hours will the temperature be 84^circ F?

May 30, 2018

12

#### Explanation:

Let the number of hours be H

Hence your equation is $54 + 2.5 H = 84$

What the equation is basically saying is that you have an initial temperature of $54$ and since you add $2.5$ to each hour, $2.5 H$ means that the unknown number of $2.5$ is added one after the other $\left(2.5 + 2.5 + 2.5 + \ldots\right)$ until the temperature amounts to $84$

$54 + 2.5 H = 84$

$2.5 H = 30$

$H = 12$

Therefore, the number of hours required is 12