Question

After the first 15 minutes of laying down cement, you have used 1/5 of the bag. What is the rate you are laying cement in bags per hour?

Answer 1

`15\ minutes=(15)/(60)hour=(1)/(4)hour\\\\ (1)/(4)h-(1)/(5)\ bag\\ 1\ hour-\ x\ bag\\\\ cross\ multiplication\\ (1)/(4)x=(1)/(5)\ \ \ | multiply\ by\ 4\\\\ x=(4)/(5)\\\\ Rate\ is\ equal\ to\ (4)/(5)\ bag\ per\ 1\ hour.`