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. how many logs does teresa need to maintain the fire for 18 hours

26 because 6 logs equals 4 hours... 
so add another 6 logs and another 4 hours which equals 12 logs and 8 hours...
Add another 6 logs and 4 hours which is now 18 logs and 12 hours 
Add 6 more logs and 4 hours again which is now 24 logs and 16 hours 
So then since 6 logs equals 4 hours if you do 3 logs it will equal 2 hours... 
so then Add 24 logs+3 which equals 27 logs and add 2 hours on 16 which would be 18 hours. 
26 logs=18 hours