When Jeffrey walks, for every three steps forward, he takes two steps backwards. Therefore, if the distance between the house and the mailbox is 66 steps, what is the total number of steps Jeffrey takes when he goes from the house to the mailbox?
Let's think: For every 3 steps forward, he adds 2 more backwards so each 'step' gained costs 5 actual steps. 66 steps distance * 5 steps moved = 330 steps total.. The answer is: 330.

Hannah harvests 5 strawberries daily for the next whole month of April, which has 30 days. If she gives away 20 strawberries to her friends and 30 strawberries are stolen, how many strawberries does she have by the end of April?
Let's think: Hannah harvests a total of 5 * 30 = 150 strawberries. After giving her friends, Hannah is left with 150 - 20 = 130 strawberries. After some were stolen, Hannah is left with 130 - 30 = 100 strawberries.. The answer is: 100.

A school has 15 classrooms. One-third of these classrooms have 30 desks in each classroom and the rest have 25 desks in each classroom. Only one student can sit at one desk. How many students can this school accommodate so that everyone has their own desk?
Let's think: One - third of the classrooms have 30 desks, so there are 1 / 3 * 15 = 5 classrooms like that. The rest, which means 15 - 5 = 10 classrooms, have 25 desks. One - third of the classrooms can fit 5 * 30 = 150 students. The rest can fit 10 * 25 = 250 students. So in total, the school can be filled with 150 + 250 = 400 students.. The answer is: 400.

John builds a model rocket that can travel 500 ft in the air. He builds a second rocket that can travel twice as high. What is the combined height of the two rockets?
Let's think:
The second rocket goes 500 * 2 = 1000 feet. So the total height is 500 + 1000 = 1500 feet.. The answer is: 1500.