The average age of an adult class is 40years. 8 new students with an avg age of 32years join the class. Therefore decreasing the average by 4year. Find what was theoriginal strength of class?  Choose the correct option:
A) 8 B) 12 C) 15 D) 17 E) 18
Let original strength = y   Then , 40y + 8 x 32 = ( y + 8) x 36   â‡’ 40y + 256 = 36y + 288   â‡’ 4y = 32   âˆ´ y = 8   8
<result>A</result>
The average age of an adult class is 40years. 8 new students with an avg age of 32years join the class. Therefore decreasing the average by 4year. Find what was theoriginal strength of class?