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Mathématiques
Middle School Math
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Name _____________________________
Date ___________________
Ratios
Complète.

1.  If venom A is two times as potent as venom B and venom C is3.4times as potent as venom B. How much more potent is venom C compared to venom A?

2.  If the ratio of saturated to unsaturated fatty acids in a cell membrane is9to1, and there are a total of73billion fatty acid molecules, how many of them are saturated?

3.  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 is13to4. If there are4,000snakes in the area, how many rodents are there?

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5.  Jonathan analyzed some pollen grains found near a site that is thought to have been inhabited by humans many thousands of years ago. He found70examples of grass pollen,18examples of oak pollen, and30examples 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 were15,000pollen grains in the area of study, how many of them would be of an unknown type?

6.  If four 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 of799armadillos?



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Ratios
Mathématiques
Middle School Math
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