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Complete.
1.   There are sixty-nine mice in the barn. If the ratio of brown mice to gray mice is 1:2 how many gray mice are there?

2.   * This is a pre-made sheet.
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Complete.
3.   If three 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 859 armadillos?

4.   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 32% G, what was the percentage of A?


 

Key #2
aKey #2
Complete.
5.   Soils around the world vary in their organic matter content. Organic matter comes from living things or things that used to be alive. For example, in comparing a soil from Nebraska to one from Arizona, it would not be unusual for the Nebraska soil to have a greater amount of organic matter by a factor of 5 to 2. If you had two such samples and the sample from Arizona contained 5 g of organic matter, how many grams of organic matter would there be in Nebraska soil of equal mass? Round your answer to the nearest hundredth.

6.   In a specimen of granite from the nearby mountain the ratio of feldspar to quartz is 3 to 2 by mass. If the mountain consists of 7 x 109 tons of granite, how much of it is feldspar. For this calculation you may assume that other minerals in the granite do not contribute significantly to its mass. Express your answer in scientific notation.


Complete.
7.   On planet X, the atmospheric pressure is lower than it is on planet Y. Interplanetary probes were recently sent to the two planets and data were obtained on many things including the atmospheric pressure. The pressure on planet Y is 18 N/m2. If the pressure on planet X is two-thirds that of planet Y, what is the pressure, in Pascals, on planet X? Round your answer to the nearest hundredth if necessary.

8.   Danielle dropped rock 1 (mass = 3.7 kg) from a height of 15 meters. She then dropped rock 2 (mass = 1.7 kg) from the same height. What was the ratio of kinetic energies of the rocks (KErock1/KErock2) when they hit the ground? (note: the acceleration of gravity is 9.81 m/s2.)


Complete.
9.   According to the instructions for a chemical procedure, Cody mixed salt, baking soda and water in a 4:1:25 ratio by mass. How many grams of water would be required to make a mixture that contained 28 grams of salt?

10.   A sample of steel made at the Bigtown Steel Works, was analyzed and found to contain 0.17% carbon (by mass). How many kilograms of this kind of steel could be made from 1.8 kg of carbon? Round your answer to the nearest hundredth if needed.


 

Key #2
aKey #2
Complete.
11.   The ratio of indoor basketballs to outdoor basketballs at the Megalopolis recreation center is 7:4. If the rec center has 46 basketballs, how many of them are indoor basketballs?

12.   Alexandra practices figure skating an average of 17 hours per week. Shelby practices figure skating an average of 1.4 hours for every hour Alexandra practices. How many hours a week does Shelby practice?


 


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