What is the median of a set of numbers if the sum of the first two numbers is 12 and the sum of the remaining three numbers is 21?
+
What is the square root of the largest perfect square less than 200?
+
What is the average salary of the employees in a company, if the salaries of the 10 employees are $25,000, $30,000, $40,000, $35,000, $28,000, $32,000, $45,000, $38,000, $42,000, and $33,000?