Question

Of the 800 participants in a marathon, 120 are running to raise money for a cause. How many participants out of 100 are running for a cause.A.12B.8C.20D.15

Answer 1

Let be "x" the number of participants out of 100 who are running for a cause​.

According to the explained in the exercise, of the 800 participants in the marathon, 120 are running to raise money for a cause.

Based on this, you can set up the following proportion:

`(800)/(120)=(100)/(x)`

Now you must solve for the variable "x", as following:

`\begin{gathered} ((800)/(120))(x)=100 \\ (800)/(120)x=100 \\ 800x=100\cdot120 \\ 800x=12,000 \\ x=(12,000)/(800) \\ x=15 \end{gathered}`

Therefore, 15 participants out of 100 are running for a cause​. The answer is: OPTION D.