The average of 10 numbers is 20 and the average of 10 other numbers is 25. What is the average of all 20 numbers?
Select:
A) 22.5
B) 21.1
C) 2.6
D) 7.5
E) 4.6
The average of 10 numbers is 20....   The sum of those numbers is (10)(20) = 200.   The average of 10 other numbers is 25....   The sum of those numbers is (10)(25) = 250   The sum of ALL 20 numbers is 200+250= 
<gadget id="calculator">200+250</gadget>
<output>450</output>
450. The average of those numbers is 450/20= 
<gadget id="calculator">450/20</gadget>
<output>45/2 = around 22.5</output>
22.5   22.5nswer is 22.5
<result>A</result>
The average of 10 numbers is 20 and the average of 10 other numbers is 25. What is the average of all 20 numbers?