In a group of 4 friends, the average age is 25 years. If one friend leaves and t

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Question: In a group of 4 friends, the average age is 25 years. If one friend leaves and the average age becomes 27 years, what is the age of the friend who left?

Options:

Correct Answer: 28

Solution:

Total age of 4 friends = 4 * 25 = 100. Total age of 3 friends = 3 * 27 = 81. Therefore, the age of the friend who left = 100 - 81 = 19.

In a group of 4 friends, the average age is 25 years. If one friend leaves and t

Practice Questions

In a group of 4 friends, the average age is 25 years. If one friend leaves and the average age becomes 27 years, what is the age of the friend who left?

Questions & Step-by-Step Solutions

In a group of 4 friends, the average age is 25 years. If one friend leaves and the average age becomes 27 years, what is the age of the friend who left?

Step 1: Calculate the total age of the 4 friends. Since the average age is 25 years, multiply 25 by 4 (the number of friends). Total age = 25 * 4 = 100 years.
Step 2: Calculate the total age of the remaining 3 friends after one friend leaves. The new average age is 27 years, so multiply 27 by 3 (the number of remaining friends). Total age of 3 friends = 27 * 3 = 81 years.
Step 3: Find the age of the friend who left. Subtract the total age of the 3 friends from the total age of the 4 friends. Age of the friend who left = 100 - 81 = 19 years.

Average Calculation – Understanding how to calculate the average age and how it changes when a member leaves the group.
Total Age Calculation – Calculating the total age of a group based on the average and the number of members.
Difference in Averages – Recognizing how the average age changes when one member is removed and how to relate that to the age of the member who left.

In a group of 4 friends, the average age is 25 years. If one friend leaves and t

What’s inside this PDF?

In a group of 4 friends, the average age is 25 years. If one friend leaves and t

Practice Questions

Questions & Step-by-Step Solutions

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