math80.sample quiz1 - wostner exercises averages set 1...

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wostner : exercises : averages set 1 copyright ©2006-2008 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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math80.sample quiz1 - wostner exercises averages set 1...

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