ASSIGNMENT
1. Saltwater The salinity of saltwater is the ratio of the mass of the salt in the water to the mass of the salt and fresh water mixed together. a. A sample of saltwater is made by mixing 3 grams of salt with 75 grams of water. Find the salinity of the sample. b. A sample of saltwater has a salinity of 3 : 45. The sample has a mass of 30 kilograms. How much salt is in the sample?
2. Jewel Cases Store A sells 10 CD jewel cases for $9. Store B sells 15 CD jewel cases for $12. How much money will you save if you buy 30 CD jewel cases at the store with the lower unit price?
3. Knitting You are knitting an afghan with red, green, and blue stripes. There are equal numbers of red and blue stripes. There are twice as many green stripes as there are red stripes. The afghan has 20 stripes.
a. Find the ratio of the number of red stripes to the total number of stripes on the afghan.
b. How many red stripes are there on the afghan?
4. Election In an election, the winning candidate received 3 votes for every vote the opponent received. Altogether, 1000 votes were cast. How many votes did the winner receive?
5. Critical Thinking In the proportion —10 1/’ = how does the value of x 6 y change as the value of x increases?
6. Challenge A painter is making a specific shade of green that requires 3 parts of yellow paint for every 4 parts of blue paint. To make the mixture, the painter uses 9 ounces of yellow paint and 2 tubes of blue paint. How many ounces are in each tube of blue paint?
