Liza reads 20 pages in an hour, and Suzie reads 15 pages in an hour. How many more pages does Liza read than Suzie in 3 hours?
Let's think: In 3 hours, Liza reads 20 x 3 = 60 pages. In 3 hours, Suzie reads 15 x 3 = 45 pages. Liza reads 60 - 45 = 15 pages more than Suzie.. The answer is: 15.

James wants to learn to become a chess grandmaster. It takes 2 hours to learn the rules. It then takes him 49 times that long to get a level of proficiency to start playing in local tournaments. After that, he devotes his life to chess and spends 100 times as much as the combined time to get proficient to becoming a master. How much total time did he spend?
Let's think: It takes him 2 * 49 = 98 hours to go from knowing how to play to proficient. So he spends 98 + 2 = 100 hours combined on those. So it takes him 100 * 100 = 10,000 hours to become a master from proficient. So the total time was 100 + 10000 = 10,100 hours.. The answer is: 10100.

Emily is 20 years old and her older sister, Rachel, is 24 years old. How old is Rachel when Emily is half her age?
Let's think: The difference in age between the two sisters is 24 - 20 = 4 years. When Rachel is twice Emily's age, she is 4 x 2 = 8 years old.. The answer is: 8.

The largest frog can grow to weigh 10 times as much as the smallest frog. The largest frog weighs 120 pounds. How much more does the largest frog weigh than the smallest frog?
Let's think:
To find the weight of the smallest frog, 120 pounds / 10 = 12 pounds for the smallest frog. The difference is 120 - 12 = 108 pounds.. The answer is: 108.