When Michelle makes fresh pasta, she first makes the dough, then she rolls it out and cuts it, and then she hangs it on racks to dry for cooking later. She needs a drying rack for each three pounds of pasta she makes, and it takes two cups of flour to make each pound of pasta dough. She owns three racks right now. How many more drying racks will Michelle need if she makes pasta using three 8-cup bags of flour?
Let's think: Michelle used 3 * 8 = 24 cups of flour in the pasta dough. She made 24 / 2 = 12 pounds of pasta dough. She needs 12 / 3 = 4 drying racks for the pasta. Thus, Michelle needs 4 - 3 = 1 more drying rack.. The answer is: 1.

Sara is 6 inches taller than her brother Joe. Joe is 3 inches taller than his friend Roy. If Roy is 36 inches tall, how tall is Sara?
Let's think: Roy is 36 inches tall. Joe is 3 + 36 = 39 inches tall. Sara is 6 + 39 = 45 inches tall.. The answer is: 45.

There are 40 Judges in the state of Rhode Island. 10 percent of Judges are under 30 years old. 60 percent of Judges are 30-50 years old. The rest of the Judges are over 50 years old. How many Judges are over 50 years old?
Let's think: Under 30: 40(.10) = 4. 30 - 50 years old:40(.60) = 24. Over 50:40 - 4 - 24 = 12 Judges.. The answer is: 12.

Brennan was researching his school project and had to download files from the internet to his computer to use for reference. After downloading 800 files, he deleted 70% of them because they were not helpful. He downloaded 400 more files but again realized that 3/5 of them were irrelevant. How many valuable files was he left with after deleting the unrelated files he downloaded in the second round?
Let's think:
The number of non - valuable files Brennan downloaded in the first round is 70 / 100 * 800 = 560 files. The number of valuable files Brennan downloaded in the first round is 800 - 560 = 240. When he downloaded 400 new files, there were 3 / 5 * 400 = 240 non - useful files, which he deleted again. The total number of valuable files he downloaded in the second round is 400 - 240 = 160. To write his research, Brennan had 160 + 240 = 400 useful files to reference to write his research.. The answer is: 400.