The average age of an adult class is 40 years. 12 new students with an avg age of 32 years join the class. Therefore decreasing the average by 6 year. Find what was the original average age of the class? Choices: A) 10 B) 12 C) 16 D) 20 E) 4

Rationale: let original strength = y then , 40 y + 12 x 32 = ( y + 12 ) x 34 â ‡ ’ 40 y + 384 = 34 y + 408 â ‡ ’ 6 y = 24 â ˆ ´ y = 4 e
Answer: E