#### If it takes 6 machines 10 hours to produce 300 items, how many items can be produced by 10 machines working at the same rate for 15 hours? 1. [ ] 900 2. [ ] 1200 3. [x] 750 4. [ ] 1800 #### Three friends decide to paint a room together. They can paint the entire room in 6 hours if they work together. The first friend can paint half of the room in 8 hours, while the second friend can paint one1. third of the room in 6 hours. How long would it take the third friend to paint the entire room alone? 1. [ ] 15 hours 2. [ ] 12 hours 3. [ ] 18 hours 4. [x] 24 hours #### A group of four workers can complete a task in 20 hours. If two new workers join the group, they can finish the same task in 12 hours. How many hours would it take for one of the original workers to complete the task alone? 1. [ ] 40 hours 2. [ ] 60 hours 3. [x] 80 hours 4. [ ] 100 hours #### A group of five workers can complete a task in 15 hours. If one worker leaves the group, the remaining workers can finish the task in 18 hours. How long would it take the worker who left to complete the task alone? 1. [ ] 45 hours 2. [ ] 60 hours 3. [ ] 72 hours 4. [x] 90 hours #### A sprinkler can water a lawn in 10 hours. If a second sprinkler that is twice as fast as the first sprinkler is used simultaneously, how long will it take to water the lawn? 1. [ ] 4 hours 2. [ ] 4 hours and 40 minutes 3. [ ] 5 hours 4. [x] 3 hours and 33 minutes