7 pupils of average age of 12 years leave a class of 25 pupils of average age 14 years. If 6 new pupil of average age 11 years join the class, what is the average age of the pupils in the class

Answer 1

First, let's calculate the total age of the original 25 pupils:

25 pupils * 14 years = 350 years

Now, let's calculate the total age of the 7 pupils who left:

7 pupils * 12 years = 84 years

Now, let's subtract the total age of the 7 pupils from the total age of the original 25 pupils:

350 - 84 = 266 years

Now, let's calculate the total age of the 6 new pupils:

6 pupils * 11 years = 66 years

Now, let's add the total age of the 6 new pupils to the total age of the remaining 18 pupils:

266 + 66 = 332 years

Finally, let's calculate the average age of the 18 pupils in the class now:

332 / 18 = 18.44 years

Therefore, the average age of the pupils in the class now is 18.44 years.