Ali has $480. He spent half of it on food, and then he spent a third of what was left on a pair of glasses. How much money did he have left?
Let's think: Ali spent 480 / 2 = $240 on food. After buying the food, Ali had 480 - 240 = $240 left. He spent 240 / 3 = 80 dollars on a pair of glasses. He had 240 - 80 = $160 left.. The answer is: 160.

There are 20 stickers on a page. If you have 12 pages of stickers but lose one of the pages, then how many stickers would you have?
Let's think: After losing one of the pages you have 12 - 1 = 11 pages of stickers. If each page has 20 stickers on it, you have 11 x 20 = 220 stickers.. The answer is: 220.

Carl is taking a class where the whole grade is based on four tests that are graded out of 100. He got an 80, a 75 and a 90 on his first three tests. If he wants an 85 average for the class, what is the minimum grade he needs to get on his last test?
Let's think: First, find the total number of points Carl needs to earn across all the tests by multiplying his desired average by the number of tests: 85 * 4 = 340 marks. Then subtract all Carl's previous test scores to find the last score he needs to earn: 340 - 80 - 75 - 90 = 95 marks.. The answer is: 95.

Roger rode his bike for 2 miles this morning, and then 5 times that amount in the evening. How many miles did Roger ride his bike for?
Let's think:
Roger rode for 2 miles in the morning, and then 5 times that in the evening for 5 * 2 = 10 miles ridden in the evening. In total, that means Roger rode 2 + 10 = 12 miles over the course of the day.. The answer is: 12.