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Ratios
Math
Middle School Math

 Name _____________________________ Date ___________________
Ratios
Complete.

 1 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 5. If there are 4,000 snakes in the area, how many rodents are there?
 2 If venom A is two times as potent as venom B and venom C is 2.6 times as potent as venom B. How much more potent is venom C compared to venom A?
 3 If there is a two in seven chance of getting a red flower when crossing a red flowered plant with a white flowered plant, how many white flowered plants would be expected in a population of 753 offspring from such a cross?
 4 If two out of every seven individuals in a population of armadillos carry a gene for a defective enzyme, how many individuals carry the normal gene in a population of 801 armadillos?
 5 There is always a 1 to 1 correspondence between the number guanines (G) and the number of cytosines (C) in a DNA molecule. The same is true of the relationship between adenine (A) and thymine (T). Of course professor Floop knows this. He analyzed a strand of DNA and determined the amounts of C and G it contained. If the molecule was 24% G, what was the percentage of A?
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