Question: Clive is buying olives for dinner. He has $10 to spend and needs 80 olives. A jar of 20 olives costs $1.50. How much change will Clive have when he buys what he needs?
Answer with step-by-step thinking: He needs 4 jars of olives because 80 / 20 = 4. He will spend $6 because 4 x 1.5 = 6. He will have $4 in change because 10 - 6 = 4.
So the answer is 4.


Question: There are 13 3-year-olds, 20 4-year-olds, 15 5-year-olds, and 22 six-year-olds at a particular Sunday school. If the 3 and 4-year-olds are in one class and the 5 and 6-year-olds are in another class, what is the average class size?
Answer with step-by-step thinking: First find the total number of 3 - and 4 - year - olds: 13 kids + 20 kids = 33 kids. Then find the total number of 5 - and 6 - year - olds: 15 kids + 22 kids = 37 kids. Then add the two class sizes: 33 kids + 37 kids = 70 kids. Then divide the number of kids by the number of classes to find the average class size: 70 kids / 2 classes = 35 kids / class.
So the answer is 35.


Question: Max was doing homework in three different subjects. It took him 20 minutes to finish tasks from biology and two times more time to finish history. Geography took him the most time, three times more than history. How much time did Max spend on doing his homework?
Answer with step-by-step thinking:
Max finished history in 20 * 2 = 40 minutes. Finishing geography took the most time, which is 40 * 3 = 120 minutes. In total, for all three subjects, Max needed 20 + 40 + 120 = 180 minutes.
So the answer is 180.