Asked by Wisdom
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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Answered by
GPT 3.5
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 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.
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