Jane can sand and refinish the hardwood floor in a certain room in 25 hours. Together with her co-worker, Alex, they can sand and refinish this room's floor in 13 hours. How many hours would it take Alex working by himself to sand and refinish this floor? Time for Alex to sand and refinish this floor: ___hours
Tremanie leaves school to walk home. His friend, Neichelle, notices 0.25 hours later that Tremanie forgot his phone at the school. So Neichelle rides her bike to catch up to Tremanie and give him the phone. If Tremanie walks at 2.8 mph and Neichelle rides her bike at 10.8 mph, find how long (in hours) she will have to ride her bike until she catches up to him. Time for Neichelle to catch up to Tremanie: __ hours A chemist needs to create a 50% HCl solution. (HCI is hydrochloric acid. A "50% HCl solution contains 50% HCL and the other 50% is water.) How much of a 92.5% HCI solution must be mixed with 90 ml of a 10% HCI solution in order to result in a 50% HCI solution? Amount of 92.5% HCI solution: __ ml A bank loaned out $2300, part of it at a rate of 7.3% per year and the rest of it at a rate of 6.4% per year. The total amount of interest owed to the bank at the end of one year was $153.7. Find the amount of money that the bank loaned out at 7.3%. Amount of money loaned at 7.3% : $__
