Average of five numbers is 9, and the sum of three of the numbers is 30, what is the average of the other 2 numbers?
Options:  A) 17  B) 15.5  C) 8.5  D) 7.5  E) 3.5
Let the five numbers be a, b, c, d, e. Then their average is (a+b+c+d+e)/5=9
a+b+c=30
(30+d+e)/5=9
30+d+e=45
d+e=15
average=15/2= 
<gadget id="calculator">15/2</gadget>
<output>15/2 = around 7.5</output>
7.5
Ans 7.5
<result>D</result>
Average of five numbers is 9, and the sum of three of the numbers is 30, what is the average of the other 2 numbers?