Bronson decides to collect Oak Leaves from around his Neighborhood. He collects 12 on Thursday and 13 on Friday. 20% are Brown and 20% are Green. The rest are yellow. How many yellow leaves does he collect?
Let's think: He collects 25 leaves because 12 + 13 = 25. 60% of them are yellow because 100 - 20 - 20 = 60. He collects 15 yellow leaves because 25 x .6 = 15.. The answer is: 15.

It takes Matt 2 minutes per problem to do his math homework with a calculator and 5 minutes per problem without a calculator. If Matt's assignment has 20 problems, how much time will using a calculator save?
Let's think: First find the time difference per problem: 5 minutes / problem - 2 minutes / problem = 3 minutes / problem. Then multiply that number by the number of problems to find the total time difference: 3 minutes / problem * 20 problems = 60 minutes.. The answer is: 60.

Sally needs to make a tablecloth that measures 102 inches by 54 inches. She also needs to make 8 napkins that are 6 by 7 inches. How many square inches of material will Sally need to make the tablecloth and the 8 napkins?
Let's think: Tablecloth = 102 * 54 = 5508 square inches. Napkins = 8 * (6 * 7) = 336 square inches. 5508 + 336 = 5844 square inches. Sally will need 5844 square inches of material to make the tablecloth and 8 napkins.. The answer is: 5844.

Jim buys a package of 20 car washes. Since He bought a package he only has to pay 60%. A carwash normally costs 15 dollars. How much did he pay for the package?
Let's think:
He had to pay for 20 * .6 = 12 car washes. That means he had to pay 12 * 15 = $180.. The answer is: 180.