SOLUTION: 3. Ginger over the course of an average work-week wanted to see how much she spent on lunch daily. On Monday and Thursday, she spent $5.43 total. On Tuesday and Wednesday, she spen
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Question 284710: 3. Ginger over the course of an average work-week wanted to see how much she spent on lunch daily. On Monday and Thursday, she spent $5.43 total. On Tuesday and Wednesday, she spent $3.54 on each day. On Friday, she spent $7.89 on lunch. What was her average daily cost?
answer: $4.08
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This question is from a practice placement test for SMC. here is the url
http://www.testprepreview.com/modules/averagesandrounding.htm
Taking the average of an average is already confusing but this problem goes beyond that. I tried using matrixes but it wont work since we have two equations but three variables. (the equations being derived from the meaning of average--such as adding two days and dividing by two)I also tried trial and error but it still did not work.
thank you for your time Answer by edjones(8007) (Show Source):
