To find the average age of the remaining 15 pupils, we first need to calculate the sum of their ages.
The sum of the ages of the 5 oldest pupils is 5 * 14 = 70 years old.
The sum of the ages of the entire class is 20 * 11 = 220 years old.
To find the sum of the remaining 15 pupils, we subtract the sum of the ages of the 5 oldest from the sum of the ages of the entire class: 220 - 70 = 150 years old.
Finally, we divide the sum of the remaining 15 pupils' ages by the number of pupils (15) to find the average age: 150 / 15 = 10 years old.
So, the average age of the remaining 15 pupils is 10 years old.
The average age of a class of 20 pupils is 11years.if each of the 5 oldest pupils in the class is 14years old what is the average age of the remaining 15 pupils
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