A teacher figures out her students’ final grade in the class by finding the mean of the following three
2 answers:
Answer:
95%
Step-by-step explanation:
To find the average, we add up all the scores and divide by 3.
We know 2 of the scores, but one is unknown, we will call it x.
Jenny wants the average to be 85, so we can set the expression equal to 85
=85
Multiply by 3 on both sides
160+x=255
Subtract 160 from both sides
x=95
She will have to score a 95 to pass the class with an 85 average
Hope this helps!
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Answer:
20x = 55
Step-by-step explanation:
First you have to add 3x to both sides of 11-3x=x
Now that you have 11 = 4x you divide 4 on both sides
11/4 = x
But you can't divide 11 by 4 unless you are looking for the decimal form of 11/4 which is 2.75
so now we take 11/4 or 2.75 depending on if you need your answer in fraction or as a decimal and replace that with x however both will equal the number 55