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wostner : exercises : averages set 1
copyright ©20062008 ulf wostner <[email protected]>
In all exercises, show all formulas, and steps.
1.
You received three paychecks that averaged $500.
a.
What was the total amount you received?
b.
If the first check was for $300 and the second for $600, what was the third
check? Set up an
equation
, and then
solve
it.
c.
You are hoping that the fourth check will bring the average up to $550.
How big should the fourth check be? Set up an
equation
, and then
solve
it.
Answer: in each of these problems you can easily verify that your answer is correct.
2.
Suppose your GPA currently is 2.65, based on 36 units. What GPA would you
need this semester (based on taking 12 units) to bring your GPA up to 2.70 ? Set
up an
equation
, and then
solve
it.
Answer: 2.85
Answer: You can check your answer by calculating the GPA based on your answer.
3.
If you drive SF to LA averaging 40 mph, and then drive back, averaging 60 mph,
what was the average speed for the entire trip?
Answer: 48.00
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This note was uploaded on 04/01/2009 for the course MATH 80 taught by Professor Wostner during the Spring '09 term at City College of San Francisco.
 Spring '09
 Wostner
 Math, Formulas

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