[Question]Gail has some bills in her wallet which amount to $100. She has four $5 bills and three $20 bills, and the rest are $10 bills. How many $10 bills are in her wallet?
[Answer]Four $5 bills amount to $5 x 4 = $20. Three $20 bills amount to $20 x 3 = $60. So Gail's $5 and $20 bills amount to $20 + $60 = $80. Thus, her $10 bills amount to $100 - $80 = $20. Therefore, she has $20 / $10 = 2 $10 bills. The answer is 2.

[Question]There are 20 hands in Peter’s class, not including his. Assume every student in the class has 2 arms and 2 hands. How many students are in Peter’s class including him?
[Answer]There are 20 + 2 of Peter’s hands = 22 hands in Peter’s class including his. There are 22 hands / 2 hands per student = 11 students. The answer is 11.

[Question]Grant has worked as a freelance math worker for the last three months. The first month he made 350$. The second month he made 50$ more than double he made the first month. The third month he quadrupled the sum of the first two months. How much did Grant make in his first three months total?
[Answer]First Month:350$. Second Month:50 + 2(350) = 750$. Third Month:4(350 + 750) = 4400$. Total:350 + 750 + 4400 = 5500$. The answer is 5500.

[Question]Before Cameron broke his right arm, he was able to type 10 words per minute on his phone. After he broke his arm, he had to use his left hand for a while, and he could only type 8 words per minute. What is the difference between the number of words he could type in 5 minutes before and after he broke his arm?
[Answer]
Before Cameron broke his hand he could type 5 × 10 = 50 words in 5 minutes. After he broke his hand he could only type 5 × 8 = 40 words in 5 minutes. The difference between the number of words he could type in 5 minutes before and after he broke his arm is 50 - 40 = 10 words. The answer is 10.