James writes from 1 PM to 4 PM every night. He can write 5 pages per hour. How many weeks will it take to finish his 735-page book? Give the rationale and then the answer.
Let's think step by step. He writes for 4 - 1 = 3 hours per day. That means he writes 3 * 5 = 15 pages per day. So it would take him 735 / 15 = 49 days. That means it will take 49 / 7 = 7 weeks.. The answer is: 7.

Jon makes 3/4's the salary that Karen makes. John makes $3000 per month. How long will it take him to make the same amount of money that Karen does in 3 months? Give the rationale and then the answer.
Let's think step by step. Karen makes $3000 / (3 / 4) = $4000 per month. In three months, Karen would make a total of $4000 * 3 = $12000. To make the same amount of money John would need to work $12000 / $3000 = 4 months.. The answer is: 4.

The teacher agrees to order pizza for the class. For every student in the class, she will buy 2 pieces of cheese and 1 piece of onion and they will eat exactly that amount. A large pizza has 18 slices. She orders 6 total pizzas and there are 8 pieces of cheese and 4 pieces of onion leftover. How many students are in the class? Give the rationale and then the answer.
Let's think step by step. Cheese pizzas are 2 / 3 of the pizza's purchased because 2 / (2 + 1) = 2 / 3. She buys 4 cheese pizzas because 6 x (2 / 3) = 4. These give her 72 pieces of cheese pizza because 4 x 18 = 72. The students at 64 pieces of cheese because 72 - 8 = 64. There are 32 students in her class because 64 / 2 = 32.. The answer is: 32.