Question: Mark spent 220 dollars to fix his car. It needed two parts that cost 20 dollars each, and labor cost .5 dollars a minute. How many hours did the mechanic work?
Answer with step-by-step thinking: Labor cost is .5 * 60 = 30 dollars per hour. The cost for parts is 20 * 2 = $40. The total cost for labor is 220 - 40 = $180. He spent 180 / 30 = 6 hours on labor.
So the answer is 6.


Question: Sarah decided to pull weeds from her garden. On Tuesday she pulled 25 weeds. The next day she pulled three times the number of weeds she did the day before. On Thursday her allergies bothered her and she could only pull up one-fifth of the weeds she pulled on the day before. Finally, on Friday it rained for half the day and she managed to pull up 10 fewer weeds than she did on Thursday. In total, how many weeds did she pull up?
Answer with step-by-step thinking: On Wednesday she pulled 25 * 3 = 75 weeds. On Thursday she pulled 75 / 5 = 15 weeds. On Friday she pulled 15 - 10 = 5 weeds. In total she pulled 25 + 75 + 15 + 5 = 120 weeds.
So the answer is 120.


Question: Simon and Peter have a big stamp collection. Simon collects red stamps and Peter collects white stamps. Simon has 30 red stamps and Peter has 80 white stamps. If the red stamps are then sold for 50 cents each and the white stamps are sold for 20 cents each, what is the difference in the amount of money they make in dollars?
Answer with step-by-step thinking:
Red stamps are 50 cents each and for 30 stamps, Simon would get 50 * 30 = 1500 cents. White stamps are 20 cents each and for 80 stamps, Peter would get 20 * 80 = 1600 cents. The difference in cents is 1600 - 1500 = 100 cents. One dollar equals 100 cents, so the difference in dollars is 100 / 100 = $1.
So the answer is 1.