The average age of an adult class is 40 years. 2 new students with an avg age of 32 years join the class. Therefore decreasing the average by 4 year. Find what was the original strength of class?
Answers:
A) 10	B) 12	C) 16	D) 2	E) 22
Let original strength = y   Then , 40y + 2 x 32 = ( y + 2) x 36   â‡’ 40y + 64 = 36y + 72   â‡’ 4y = 8   âˆ´ y = 2   2
<result>D</result>
The average age of an adult class is 40 years. 2 new students with an avg age of 32 years join the class. Therefore decreasing the average by 4 year. Find what was the original strength of class?