Answer the following question.
John goes to the market with €100. He buys a roast for €17 and vegetables for €11. How much money does he have left?
Step-by-step reasoning process: He spent 17 + 11 = €28. So, he still has 100 – 28 = €72 remaining.
The answer is 72.

Answer the following question.
Ellie takes her little brother down to the pond to teach him how to skip stones. After he takes his first throw, she gives him pointers to improve his technique. His second throw skips two more times across the water than his first. His third throw skips twice as many times as his second. His fourth throw skips 3 fewer times than his third throw. His fifth throw skips one more time than the fourth throw. If his fifth throw skipped 8 times across the water, how many skips did he make in total between all of his throws?
Step-by-step reasoning process: His fourth throw made 8 - 1 = 7 skips. His third throw made 7 + 3 = 10 skips. His second throw made 10 / 2 = 5 skips. His first throw made 5 - 2 = 3 skips. The total number of skips is 8 + 7 + 10 + 5 + 3 = 33 skips.
The answer is 33.

Answer the following question.
John invests in a bank and gets 10% simple interest. He invests $1000. How much money does he have after 3 years?
Step-by-step reasoning process: He gets 1000 * .1 = $100 a year. So after 3 years, he gets 100 * 3 = $300. So he has 300 + 1000 = $1300.
The answer is 1300.

Answer the following question.
Emery and Serena go to their school library, and each borrows a copy of The life of Jack Steve's book to read for their school project. If Emery can read five times as fast as Serena, and the book takes her 20 days to read, what's the average number of days the two take to read the book?
Step-by-step reasoning process: If Emery took twenty days to read the book, then it took Serena 5 * 20 = 100 days to read the whole book. The total number of days taken by the two to read the book is 100 + 20 = 120 days. The average number of days the two take to read the book is 120 / 2 = 60 days.
The answer is 60.