The average of 9 numbers is 7 and the average of 7 other numbers is 11. What is the average of all 16 numbers?
Pick one:  A) 9  B) 8 3/4  C) 7 7⁄8  D) 7 1⁄2  E) 7 1⁄4
The average of 9 numbers is 7....   The sum of those numbers is (9)(7) = 63.   The average of 7 other numbers is 11....   The sum of those numbers is (7)(11) = 77   The sum of ALL 16 numbers is 63+77= 
<gadget id="calculator">63+77</gadget>
<output>140</output>
140. The average of those numbers is 140/16= 35/4 = 8 3/4.   Final Answer:   [Reveal]Spoiler:   8 3/4
<result>B</result>
The average of 9 numbers is 7 and the average of 7 other numbers is 11. What is the average of all 16 numbers?