Yesterday, Shane's Doughnut Shop sold 1/2 as many chocolate doughnuts as cinnamon doughnuts. If they sold 3 1/6 trays of cinnamon doughnuts, how many trays of chocolate doughnuts did they sell?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

How do you solving the solution of each system using elimination?