After evaluating his students on the final exams. Professor Oscar reviews all 10 questions on each exam. How many questions must he review if he has 5 classes with 35 students each?
Let's think: For each class, he has to review the questions of 35 students, in total, he will review 10 * 35 = 350 questions. For the 5 classes, he will review a total of 350 * 5 = 1750 questions.. The answer is: 1750.

To get to work, Ryan bikes one day a week takes the bus three times a week and gets a ride from a friend once a week. It takes him thirty minutes to bike to work. The bus takes ten minutes longer since it stops at every bus stop for other passengers. His friend driving him is the fastest and cuts two-thirds off his biking time. How many minutes does he spend every week commuting to work?
Let's think: The bus to Ryan’s work takes 10 minutes longer than his bike ride, so it takes 10 + 30 = 40 minutes. Ryan takes the bus 3 times a week, so the bus rides take 40 * 3 = 120 minutes a week. His friend cuts two - thirds off his biking time, which is 2 / 3 * 30 = 20 minutes a week. This means his friend takes 30 - 20 = 10 minutes to drive him. Therefore, Ryan spends 120 + 10 + 30 = 160 minutes every week commuting to work.. The answer is: 160.

Erin counts six trolls hiding by the path in the forest, 6 less than four times that number of trolls hiding under the bridge, and half as many trolls hiding in the plains as under the bridge. How many trolls did she count in total?
Let's think: First, multiply the number of forest trolls by 4: 6 trolls * 4 = 24 trolls. Then subtract 6 from that number to find the number of bridge trolls: 24 trolls - 6 trolls = 18 trolls. Then divide that number by 2 to find the number of plains trolls: 18 trolls / 2 = 9 trolls. Then add the number of trolls she saw in each location to find the total number: 6 trolls + 18 trolls + 9 trolls = 33 trolls.. The answer is: 33.

John has 54 pieces of gum, Cole has 45 pieces of gum and Aubrey has no pieces of gum. They decide to share the gum equally between the 3 of them. How many pieces of gum will each one get?
Let's think:
Total pieces of gum are 54 pieces + 45 pieces + 0 pieces = 99 pieces. When the pieces are shared equally amongst 3 people, each one gets 99 pieces / 3 people = 33 pieces / person.. The answer is: 33.