Question

There are 500 people in a survey to answer two yes-or-no questions, for the first question, 440 people has a "yes" answer, for the second question, 220 people has a "yes" answer, K is the number of people that has two "yes" answers, what’s the minimum value of K?

Answer 1

Mininum value of K is 220

Explanation:

400 people has a "yes" answer for the first question and 220 people has a "yes" answer for the second question

There is a possibility that 220 out of the 400 people that has a "yes" answer for the first question also has a "yes" for the second question

Therefore, the minimum number of people that has two "yes" answer (K) is 220