1. Teachers divided students into groups of 3. Each group of 3 wrote a report that had 9 pictures in it. The students used 585 pictures altogether. How many students were there in all?
  2. A can do a work in 14 days and working together A and B can do the same work in 10 days. In what time can B alone do the work?
  3. You are raising money for a charity. Someone made a fixed donation of 500. Then, you require each participant to make a pledge of 25 dollars. What is the minimum amount of money raised if there are 224 participants.
  4. Joan and her friend, Kevin, are having a contest to see who can save the most money. Joan has already saved $110 and every week she saves an additional $20. Kevin has already saved $80 and every week he saves an additional $25. Let x represent the number of weeks and y represent the total amount of money saved. Determine in how many weeks Joan and Kevin will have the same amount of money.
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