1. 
* This is a premade sheet. Use the link at the top of the page for a printable page. 

2. 
If the ratio of saturated to unsaturated fatty acids in a cell membrane is 9 to 1, and there are a total of 79 billion fatty acid molecules, how many of them are saturated?


3. 
If venom A is three times as potent as venom B and venom C is 3.7 times as potent as venom B. How much more potent is venom C compared to venom A?


4. 
Aaron analyzed some pollen grains found near a site that is thought to have been inhabited by humans many thousands of years ago. He found 75 examples of grass pollen, 18 examples of oak pollen, and 25 examples of unknown kinds of pollen. Let's assume his analysis was typical of the site and that another scientist could study the site and determine the exact same proportions of the three classes of pollen. Assuming this, if there were 18,000 pollen grains in the area of study, how many of them would be of an unknown type?


5. 
In a population of 768,846 cells some are undergoing division and some are not. Assume that while some of the cells are dividing, no other cells will begin to divide to until the group that is dividing is finished. Let's say the ratio of dividing to not dividing cells is 8 to 5. What will the cell population be after the cells that are dividing have completed the division process?


6. 
In a certain desert environment there are a lot of small rodents. There also happen to be a lot of snakes that feed on the rodents. The ratio of rodents to rodent eating snakes is 13 to 4. If there are 3,800 snakes in the area, how many rodents are there?

