The average age of an adult class is 50 years. 12 new students with an avg age of 32 years join the class. Therefore decreasing the average by 4 years. Find what was the original average age of the class? Choose the correct choice from the following:
A) 10
B) 12
C) 42
D) 20
E) 22
Let original strength = y   Then , 50y + 12 x 32 = ( y + 12) x 46   â‡’ 50y + 384 = 46y + 552   â‡’ 4y = 168   âˆ´ y = 42   42
<result>C</result>
The average age of an adult class is 50 years. 12 new students with an avg age of 32 years join the class. Therefore decreasing the average by 4 years. Find what was the original average age of the class?