The average of five numbers is 20. If one number is excluded, the average becomes 18. The excluded number is?  Choose the correct answer.
A) 25
B) 28
C) 32
D) 40
E) 16
Excluded number = 20*5-18*4 = 100-72= 
<gadget id="calculator">100-72</gadget>
<output>28</output>
28   Answer is 28
<result>B</result>
The average of five numbers is 20. If one number is excluded, the average becomes 18. The excluded number is?