If the average of 5 numbers is 60, what is the average of the first 4 numbers if

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Question: If the average of 5 numbers is 60, what is the average of the first 4 numbers if the fifth number is 80?

Options:

Correct Answer: 55

Solution:

Total of 5 numbers = 5 * 60 = 300. Total of first 4 numbers = 300 - 80 = 220. Average of first 4 = 220 / 4 = 55.

If the average of 5 numbers is 60, what is the average of the first 4 numbers if the fifth number is 80?

If the average of 5 numbers is 60, what is the average of the first 4 numbers if the fifth number is 80?

Step 1: Understand that the average of 5 numbers is given as 60.
Step 2: Calculate the total of the 5 numbers by multiplying the average by the number of numbers: 5 * 60 = 300.
Step 3: Identify that the fifth number is 80.
Step 4: Calculate the total of the first 4 numbers by subtracting the fifth number from the total of the 5 numbers: 300 - 80 = 220.
Step 5: Find the average of the first 4 numbers by dividing the total of the first 4 numbers by 4: 220 / 4 = 55.

Average Calculation – Understanding how to calculate the average of a set of numbers and how to manipulate totals based on given averages.
Basic Arithmetic – Applying basic arithmetic operations to find totals and averages.