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easy prob bt cudnt do

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by divya23 » Mon Jun 06, 2011 10:15 am
A certain car averages 25 miles per gallon wen driven in city and 40mpg on hiway..
find no of mpg wen car averages 10 miles in city and 50 miles on hiway..
28
26
30
36
38

oa 36
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by sunilramu » Mon Jun 06, 2011 10:18 am
Total Distance = 60
Total gallons used = 10/25 + 50/40 = 33/20

Avg mpg = 60 * 20 / 33 ~ 36

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by champ0007 » Mon Jun 06, 2011 10:28 am
Total Miles Travelled = 60

Total Gas used = 10/25 + 50/40 = 33/20

Average=60/(33/20) = 400/11 = ~36

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by cans » Mon Jun 06, 2011 4:31 pm
city-25mpg
thus for 10 miles, gallons used = 10/25=2/5
highway 40- mpg
thus for 50 miles, gallons used = 50/40=5/4
total distance = 60 miles. total gallons used = 2/5 + 5/4 = 33/20
thus mpg = 60/(33/20)=400/11=36.4
Thus 36
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