Question: On a quiz, Martin answered three fewer questions correctly than Kelsey, and Kelsey answered eight more questions correctly than Campbell. If Campbell answered 35 questions correctly, how many did Martin answer correctly?
Answer with step-by-step thinking: Kelsey answered 35 + 8 = 43 correctly. Martin answered 43 - 3 = 40 correctly.
So the answer is 40.


Question: If Stu has 9 books and Albert has 4 times as many books as Stu, how many books do Stu and Albert have in total?
Answer with step-by-step thinking: Albert has 4 * 9 books belonging to Stu = 36 books. So the pair have a combined total of 36 books belonging to Albert + 9 books belonging to Stu = 45 books.
So the answer is 45.


Question: Carolyn practices the piano for 20 minutes a day and the violin for three times as long. If she practice six days a week, how many minutes does she spend practicing in a month with four weeks?
Answer with step-by-step thinking:
First find Carolyn's total violin practice time by tripling her piano practice time: 20 minutes / day * 3 = 60 minutes / day. Then find the total amount of time she spends practicing each day: 60 minutes / day + 20 minutes / day = 80 minutes / day. Then find the total time she spends practicing each week: 80 minutes / day * 6 days / week = 480 minutes / week. Then find the total time she spends practicing each month: 480 minutes / week * 4 weeks / month = 1920 minutes / month.
So the answer is 1920.