Q92. - Algebra 1

Question

HEALTH About 20% the time you sleep is spent in rapid eye movement (REM), which is associated with dreaming. If an adult sleeps 7 for 8 hours, how much time is spent in REM sleep?

Step-by-Step Solution

Answer

An adult spent $\mathbf{1}\mathbf{.}\mathbf{4}\mathbf{ }\text{to }\mathbf{1}\mathbf{.}\mathbf{6}\mathbf{ }\mathbf{hours}$ time in REM sleep.

Step 1. Find the time spent in REM.

Time spent in REM when the person sleeps for 7 hours is

$$\begin{gathered} 20\%\times 7=0.20\times 7 \\ =1.4\text{ hours} \end{gathered}$$

Step 2. Find the time spent in REM.

Time spent in REM when the person sleeps for 8 hours is

$$\begin{gathered} 20\%\times 8=0.20\times 8 \\ =1.6\text{ hours} \end{gathered}$$

Step 3. Write a conclusion.

For a person who sleeps for 7 to 8 hours, the time spent in REM is between 1.4 to 1.6 hours, both inclusive.