Three years ago, the average age of M and N was 18 years. With P joining them, the average age becomes 22 years, How old is P now?
Choose the correct choice from the following answers.
A) 24 years
B) 27 years
C) 28 years
D) 30 years
E) 40 years
Explanation :   Present age of (M + N) = (18 x 2 + 3 x 2) years = 42 years.   Present age of (M + N + P) = (22 x 3) years = 66 years. P's age = (66 - 42)= 
<gadget id="calculator">(66 - 42)</gadget>
<output>24</output>
24 years.   24 yearsnswer : 24 years
<result>A</result>
Three years ago, the average age of M and N was 18 years. With P joining them, the average age becomes 22 years, How old is P now?