A group of 4 friends has an average age of 25 years. If one friend leaves and th

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Question: A group of 4 friends has an average age of 25 years. If one friend leaves and the average age becomes 26 years, what is the age of the friend who left?

Options:

Correct Answer: 26

Solution:

Total age of 4 friends = 4 * 25 = 100. New total age for 3 friends = 3 * 26 = 78. Age of friend who left = 100 - 78 = 22.

A group of 4 friends has an average age of 25 years. If one friend leaves and th

Practice Questions

A group of 4 friends has an average age of 25 years. If one friend leaves and the average age becomes 26 years, what is the age of the friend who left?

Questions & Step-by-Step Solutions

A group of 4 friends has an average age of 25 years. If one friend leaves and the average age becomes 26 years, what is the age of the friend who left?

Step 1: Calculate the total age of the 4 friends using the average age. Multiply the average age (25 years) by the number of friends (4). So, 25 * 4 = 100 years.
Step 2: Calculate the new total age of the remaining 3 friends after one friend leaves. Multiply the new average age (26 years) by the number of remaining friends (3). So, 26 * 3 = 78 years.
Step 3: Find the age of the friend who left by subtracting the new total age of the 3 friends (78 years) from the original total age of the 4 friends (100 years). So, 100 - 78 = 22 years.
Step 4: Conclude that the age of the friend who left is 22 years.

Average Calculation – Understanding how to calculate the average age and how it changes when one member leaves the group.
Total Age Calculation – Calculating the total age of a group based on the average and the number of members.
Subtraction for Individual Age – Using subtraction to find the age of the individual who left based on the change in total age.

A group of 4 friends has an average age of 25 years. If one friend leaves and th

What’s inside this PDF?

A group of 4 friends has an average age of 25 years. If one friend leaves and th

Practice Questions

Questions & Step-by-Step Solutions

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