Five years ago, the average age of A and B was 15 years. Average age of A, B and C today is 20 years. How old will C be after 20 years?  Select the correct option:
A) 30  B) 35  C) 40  D) 50  E) 60
Explanation :   (A + B), five years ago = (15 * 2)= 
<gadget id="calculator">(15 * 2)</gadget>
<output>30</output>
30 years.   (A+B), now= (30+5*2)= 
<gadget id="calculator">(30+5*2)</gadget>
<output>40</output>
40 years.   (A + B + C), now= (20 x 3) years =60 years.   C, now = (60 - 40)= 
<gadget id="calculator">(60 - 40)</gadget>
<output>20</output>
20 years.   C, after 20 years= (20 + 20)= 
<gadget id="calculator">(20 + 20)</gadget>
<output>40</output>
40 years.   Answer : 40
<result>C</result>
Five years ago, the average age of A and B was 15 years. Average age of A, B and C today is 20 years. How old will C be after 20 years?