Question

The U.S census bureau reported that 9 out of every 20 joggers at female. On a trail there were 230 joggers on July 4. Approximately how many were female?

Answer 1

Approximately 104 joggers are female

Explanation:

The U.S census bureau reported that 9 out of every 20 joggers at female.

Let x be the number of females out of 230 joggers.

Rewrite it as

`\begin{array}{cc}\text{Female}&\text{All joggers}\\9&20\\x&230\end{array}`

Now we can write a proportion:

`(9)/(x)=(20)/(230)`

Cross multiply:

`20x=9\cdot 230\\ \\2x=9\cdot 23\ [\text{Divided by 10}]\\ \\x=(9\cdot 23)/(2)=(207)/(2)=103.5\approx 104`