College students were polled about favorite types of food. 50% liked pizza, 40% liked hamburgers, and 20% liked both. What percent liked pizza OR hamburgers?
Number(A OR B) = Number(A) + Number(B) - Number(A AND B)
To determine the percentage of college students who liked either pizza or hamburgers, we need to add the percentages of those who liked pizza and those who liked hamburgers, and then subtract the percentage who liked both.
First, let's find the percentage who liked only pizza. Given that 50% liked pizza and 20% liked both, we subtract 20 from 50 to get 30% (50% - 20% = 30%).
Next, let's find the percentage who liked only hamburgers. Since 40% liked hamburgers and 20% liked both, we subtract 20 from 40 to get 20% (40% - 20% = 20%).
Now, let's add the percentages of those who liked only pizza and those who liked only hamburgers: 30% + 20% = 50%.
Therefore, 50% of college students polled liked either pizza or hamburgers.