Consider the Q and A. Q: Randy just turned 12 and started playing the piano. His friend Sheila told him about the 10,000-hour rule which says, after 10,000 hours of practice, you become an expert or master in your field. If Randy wants to become a piano expert before he is 20, how many hours a day will he need to practice if he practices every day, Monday – Friday, and takes two weeks off for vacation each year?
A: 5
What is the step-by-step reasoning process?
Step-by-step reasoning process: Randy has 20 – 12 = 8 years until he is 20. He must practice 10,000 hours / 8 years = 1,250 hours a year to become an expert. There are 52 weeks in a year – 2 weeks of vacation Randy plans to take = 50 weeks of practice for Randy. Randy will practice Monday – Friday, which is 5 days a week, so 50 weeks x 5 days = 250 days of practice each year. Randy will need to practice 1250 hours / 250 days = 5 hours each day.

Consider the Q and A. Q: Kim has 12 nail polishes. Heidi has 5 more nail polishes than Kim, and Karen has 4 fewer nail polishes than Kim. How many nail polishes does Karen and Heidi have together?
A: 25
What is the step-by-step reasoning process?
Step-by-step reasoning process: Heidi has 12 + 5 = 17 nail polishes. Karen has 12 - 4 = 8 nail polishes. Heidi and Karen have 17 + 8 = 25 nail polishes together.

Consider the Q and A. Q: Nathan wants to line the inside of a box with velvet. The box has two long sides that measure 8 inches by 6 inches, two short sides that measure 5 inches by six inches and a top and a bottom that each measure 40 square inches. How many square inches of velvet does Nathan need?
A: 236
What is the step-by-step reasoning process?
Step-by-step reasoning process: First find the area of each long side by multiplying the length and width: 8 inches * 6 inches = 48 square inches. Then do the same thing for each short side: 5 inches * 6 inches = 30 square inches. Now add the area of one long side, one short side, and one top / bottom together: 48 square inches + 30 square inches + 40 square inches = 118 square inches. Now double that quantity because there are two of each kind of side: 118 square inches * 2 = 236 square inches.

Consider the Q and A. Q: Mel is three years younger than Katherine. When Katherine is two dozen years old, how old will Mel be in years?
A: 21
What is the step-by-step reasoning process?
Step-by-step reasoning process:
When Katherine is 2 dozen years old, she will be 2 * 12 = 24 years old. If Mel is three years younger than Katherine, then when Katherine is 24 years old, Mel will be 24 - 3 = 21 years old.