Q: Sally is selling boxes of crackers for her scout troop's fund-raiser. If she sells 50% more on Sunday than she sold on Saturday, then she'll have sold a total of 150 boxes on the two days. How many boxes did she sell on Saturday?
A: Let S be the number of boxes sold on Saturday. S + 1.5S = 150. 2.5S = 150. S = 60. Sally sold 60 boxes on Saturday. The answer is 60.

Q: Tim buys a book of esoteric words. He learns 10 words from it a day. In 2 years the book has increased the number of words he knows by 50%. How many words did he know originally?
A: In 2 years there are 365 * 2 = 730 days. So he has learned 730 * 10 = 7300 words. He knew 1 / .5 = 2 times that number of words before the book. So he knew 7300 * 2 = 14600 words before. The answer is 14600.

Q: Oxford High School has 48 teachers, 1 principal and 15 classes with each having 20 students. How many people are there in total in Oxford High School?
A:
There are 48 teachers. There is 1 principal. There are 15 classes 20 students / class = 300 students. The total number of people in Oxford High School are 300 people + 48 people + 1 people = 349 people. The answer is 349.