They should charge $40 per membership, and they will make a maximum revenue of $2400
4/3
explanation : just write it in fraction form
In this big ol' word problem, this is just an instance of basic multiplication/division.
If it takes it 1 hour for 3 meters...
12 ÷ 3 = 4.
It would take 4 hours for the water level to change to 12 meters.
We know that 30 is 5/6 of the list. So we can find out how many words are on the list with the following equation:
![\frac{5}{6} x=30](https://tex.z-dn.net/?f=%20%5Cfrac%7B5%7D%7B6%7D%20x%3D30)
Solve for x by isolating it. First we multiply both sides by 6 to cancel out the one-sixth.
![5x = 180](https://tex.z-dn.net/?f=5x%20%3D%20180)
Next divide both sides by 5 to cancel out the 5 being multiplied to the x.
![x = 36](https://tex.z-dn.net/?f=x%20%3D%2036)
The answer is 36 words.