Posted by cornfarmer on August 19, 2008 at 14:47:53 from (12.43.88.120):
OK, I admit it-my math skills need help.If a car gets 25 mpg in the city, and 40 mpg highway, what is the average if driven for 10 miles in the city and 50 miles in the country. Problem is, I come up with two different answers depending on my method. Method 1-weighted average-since 50 is a multiple of 10, I should be able to add 25+40+40+40+40+40=225. Then take 225/6=37.5 mpg. Method 2-fuel consumed. The car uses .4 gallons of gas to go 10 miles at 25mpg, and 1.25 gallons of gas to go 50 miles at 40mpg. So, 1.25+.4=1.65 gallons used. 60 miles divided by 1.65 gallons used=36.36mpg. Question is, which one is correct?
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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