Because we see people eating "healthy" and they lost a lot of weight, so our brain thinks: "I want a body likr that too, lemme try that diet!" The same goes for advertisements for fast food chains and other restaurants. We follow our interests on Social Media, so we naturally think that everything we see there is good.
Answer: the answer is 240=3c. So then when you divide, they spent 80$ per night. And to check your work, multiply 80 by the amount of nights they stayed. Should get $240
