Teresa is maintaining a camp fire. She can keep the fire burning for 4 hours with 6 logs. She wants to know how many logs (y) she needs to keep the fire burning for 18 hours. She assumes all logs are the same.

Question

How many logs does Teresa need to maintain the fire for 18 hours?

Answer 1

To maintain the fire for 4 hours, Teresa needs 6 logs.
To maintain the fire for 1 hour, Teresa needs 6 logs / 4 hours = 1.5 logs.
Therefore, to maintain the fire for 18 hours, Teresa needs 1.5 logs/hour * 18 hours = 27 logs. Answer: \boxed{27}.