RHL School

Mathematics Problem Solving
Volume 4, Number 18, January 25, 1999


Note: See the introduction to averaging. http://www.rhlschool.com/math3n18.htm

1. Oscar loves to eat out. He prefers to eat by himself so that there will be more room at the table for his food. He goes to fast food restaurants and to very fancy restaurants as well. Here is a list of where he’s eaten this month and how much his meals have cost.

Donna's Deli $ 18.95
The Gourmet Grill $ 51.25
Burger Belt Buster $ 22.10
The Fat Farm $ 41.96
The Chili Choice $ 19.01
The Sub Standard $ 16.85
Napkin Nation $ 50.73

What is the average price that Oscar has paid for those meals?

2. Kristen took five math tests during this marking period. She got 100% on the first four tests, but she got a zero on the last one because she kept talking during the test. Kristen probably would have had a 100% average on her tests, but ended up with only an _______% average instead.

3. The average of two numbers is always the number that comes exactly between them. The average is exactly as much greater than the smaller number as it is less than the larger number. For example, the average of 10 and 20 is 15. It’s 5 more than 10 and 5 less than 20. It’s right in the middle.

What is the average of 3 and 4? __________


4. Maria is hoping to get at least a 90% average on her next report card. She’ll get a 78 in reading, a 95 in math, a 92 in English, a 99 in spelling, and a 95 in social studies. The only other subject is science. Maria must get at least _______ in science to get her 90 percent average.


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