The average of three numbers is 15. If one of the numbers is 12, what is the ave

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Question: The average of three numbers is 15. If one of the numbers is 12, what is the average of the other two numbers?

Options:

Correct Answer: 15

Solution:

Total of three numbers = 3 * 15 = 45. Sum of other two numbers = 45 - 12 = 33. Average = 33 / 2 = 16.5.

The average of three numbers is 15. If one of the numbers is 12, what is the average of the other two numbers?

The average of three numbers is 15. If one of the numbers is 12, what is the average of the other two numbers?

Correct Answer: 16.5

Step 1: Understand that the average of three numbers is given as 15.
Step 2: Use the formula for average, which is (Sum of numbers) / (Number of numbers).
Step 3: Since the average is 15 for three numbers, calculate the total sum of the three numbers: 3 * 15 = 45.
Step 4: One of the numbers is given as 12. To find the sum of the other two numbers, subtract 12 from the total sum: 45 - 12 = 33.
Step 5: Now, to find the average of the other two numbers, divide their sum (33) by 2: 33 / 2 = 16.5.

Average Calculation – Understanding how to calculate the average of a set of numbers and how to manipulate the total sum to find averages of subsets.
Basic Arithmetic – Applying basic arithmetic operations such as addition and division to solve for unknowns.