Teresa is maintaining a camp fire. She has kept the fire steadily burning for 4 hours with 6 logs. She wants to know how many logs she needs to keep the fire burning for 18 hours.
Select the equations Teresa can use, and determine the number of logs she needs to maintain the fire for 18 hours. Select all that apply.

x/6=4/18

x/18=6/4

x/4=18/6

4/6=18