Problem 24. if the sides of a square are doubled, the area increases by 147 cm . find the sides of the original square. to receive full credit, you must setup an algebraic equation and solve it. problem 25. mike and dan, working together, can paint the exterior of a house in 3 days. mike, by himself, can complete this job in 5 days less than dan. how long will it take mike to complete the job by himself? round your answer to the nearest tenth. to receive full credit, you must setup an algebraic equation and solve it. problem 26. a pool in the shape of a circle measures 10 feet across. one cubic yard of concrete is to be used to create a circular border of uniform width around the pool. if the border is to have a depth of 3 inches, how wide will the border be? to receive full credit, you must setup an algebraic equation and solve it. problem 27. the time required to lay a sidewalk varies directly as its length and inversely as the number of people who are working on the job. if three people can lay a sidewalk 100 feet long in 15 hours, how long would it take two people to lay a sidewalk 40 feet long?