Write up your solutions neatly and give a clear explanation (including diagrams, if appropriate) regarding your thought process. Also, identify the type of problem-solving strategy (or strategies) and the process that you used to attack your problem. #8 When a teacher counted her students in groups of 4, there were two students left over. When she counted them in groups of 5, she had one student left over. If 15 of her students were girls and she had more girls than boys, how many students did she have? #9 Four people want to cross a river. There is only one boat available, and it can carry a maximum of 200 pounds. The weights of the four people are 190, 170, 110, and 90 pounds. How can they all manage to get across the river, and what is the minimum number of crossings required for the boat? #10 How can a chef use an 11-minute hourglass and a 7- minute hourglass to accurately time vegetables that must steam exactly 15 minutes