averagedude23 wrote:
A certain car averaged 20 miles per gallon of gasoline on a trip from City N to City P and averaged 25 miles per gallon on the return trip, which followed a different route. How many miles per gallon did the car average for the round trip?
(1) The round trip was 175 miles.
(2) The trip from City P was 3/4 as many miles as the trip to CityP.
Trip From City N to CityP
- Distance =\(d_1\)
- Mileage =\(20\) gallon/mile
- Gasoline Used =\(20*d_1\) gallons
Trip From City P to CityN
- Distance =\(d_2\)
- Mileage =\(25\) gallon/mile
- Gasoline Used =\(25*d_2\) gallons
Question - How many miles per gallon did the car average for the round trip?
Average miles per gallon =\( \frac{\text{Total Miles Travelled}}{\text{Total Gasoline Consumed}} = \frac{d_1+d_2}{20d_1 +25d_2}\)
Statement1
(1) The round trip was 175miles.
\( d_1 + d_2 =175\)
We don't know the amount of gasoline consumed. Hence, the statement alone is not sufficient. We can eliminate A and D.
Statement2
[color=#0000ff] (2) The trip from City
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Statistics : Posted by gmatophobia • on 10 Nov 2023, 09:44 • Replies 1 • Views 125
