Here's a puzzle: How many students were surveyed?

A group of middle school students completed the survey shown below:


1.Do you like Cappuccino Fudge Swirl Ice Cream? Yes No


2.Do you like Cookies and Cream Ice Cream? Yes No





When the results were tallied, it turned out that 80 answered "yes" to the first question, 70 answered "yes" to the second question, 60 responded "yes" to both questions, and 10 said "no" to both flavors. How many students were surveyed?

Here's a puzzle: How many students were surveyed?
60+(80-60)+(70-60)+10=100