### Instruction: Eighty percent of adults drink coffee and seventy percent drink tea. What is the smallest possible percent of adults who drink both coffee and tea?### Response: I want to find the smallest percent of adults who drink both coffee and tea, so I need to minimize the overlap between the two groups.
The total percent of adults who drink either coffee or tea or both is at most 100%, since I can't have more than the whole population.
If I let x be the percent of adults who drink both coffee and tea, then I can write an inequality that relates x to the given percentages: 80 + 70 - x <= 100.
This inequality simplifies to x >= 50.
So the smallest possible value of x is 50, which means the smallest possible percent of adults who drink both coffee and tea is 50%.