SOLUTION: how do you find the missing number to get a certain average with 5 numbers.
Algebra.Com
Question 486077: how do you find the missing number to get a certain average with 5 numbers.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
how do you find the missing number to get a certain average with 5 numbers.
:
Let x = the missing grade
An example the 5 grades: 84, 88, 79, 92, x
The certain average is 85
:
The equation
= 85
which is:
= 85
multiply both sides by 5,
343 + x = 5*85
343 + x = 425
subtract 343 from both sides
x = 425 - 343
x = 82 would be the missing grade to obtain an 85 average
RELATED QUESTIONS
how do you find the missing number (averages)?
homework grade 87
homework grade 79... (answered by oscargut)
if you are given two numbers and the average, and the question asks for the third number... (answered by solver91311)
How do I find the missing number for the average.
The average of these numbers... (answered by Edwin McCravy)
how do u find the missing numbers on a number line if the missing numbers are the same... (answered by CubeyThePenguin)
how to get the answer when you have the average but you are missing a number in the... (answered by josmiceli)
how do you find missing numbers on a number line when they are equal distances apart?... (answered by Fombitz)
How do you find the interest with a a missing... (answered by rfer)
What do you do if an squared root of an number comes out as an dismal and the question... (answered by stanbon)
how do you find the missing angle (answered by richwmiller)