Step 1. Call the unknown number x.
Step 2. Set up an equation using the law of averages. (To average n numbers you add the n numbers and divide their sum by n.
Step 3. Solve the equation for the unknown.
Directions: The average of four numbers is 11. If three of the numbers are 7, 20 & 12, What is the fourth number?
Step 1.
x = unknown number
Step 2.
Step 3.
Directions: Please solve the following
1. The average of three numbers is 47. If two of the numbers are 6 & 8, what is the third number?
2. The average of three numbers is 12. If two of the numbers are 8 & 23, what is the third number?
3. The average of four numbers is 14.75. If three of the numbers are 5, 9 and 37, what is the fourth number?
4. You want your test average to be more than 90. If your test scores at current are 89, 88, 82, what do you need to get on your fourth test to raise your average into the desired range?
Directions: Please write 1-2 paragraphs that address the following.