A new street sweeping machine can sweep a town's streets in 20 fewer hours than it takes the old machine. Working together, the two machines can complete the job in 24 hours. How long does it take each machine to complete the job working alone?

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?