The average of 4 numbers is 30. If one number is 10, what is the average of the

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Question: The average of 4 numbers is 30. If one number is 10, what is the average of the other three numbers?

Options:

Correct Answer: 28

Solution:

Total of 4 numbers = 4 * 30 = 120. Total of other three numbers = 120 - 10 = 110. Average of other three = 110 / 3 = 36.67, approximately 36.

The average of 4 numbers is 30. If one number is 10, what is the average of the other three numbers?

The average of 4 numbers is 30. If one number is 10, what is the average of the other three numbers?

Correct Answer: 36

Step 1: Understand that the average of 4 numbers is 30.
Step 2: Calculate the total of the 4 numbers by multiplying the average by the number of numbers: 4 * 30 = 120.
Step 3: One of the numbers is given as 10.
Step 4: To find the total of the other three numbers, subtract the known number from the total: 120 - 10 = 110.
Step 5: Now, to find the average of the other three numbers, divide their total by 3: 110 / 3 = 36.67.
Step 6: Round 36.67 to the nearest whole number, which is approximately 36.

Average Calculation – Understanding how to calculate the average of a set of numbers and how to manipulate the total when one number is known.
Basic Arithmetic – Applying basic arithmetic operations to find totals and averages.