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From A to B, 20 miles per gallon of gas; from B to A, [#permalink]
04 Mar 2008, 09:25

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A

B

C

D

E

Difficulty:

(N/A)

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From A to B, 20 miles per gallon of gas; from B to A, different route, 25 miles per gallon of gas. What is the average gas per mile for the round trip? (1) round trip is 175 miles long. (2) from B to A the distance is 3/4 of distance from A to B.

Please kindly provide explanations for the following question

From A to B, 20 miles per gallon of gas; from B to A, different route, 25 miles per gallon of gas. What is the average gas per mile for the round trip? (1) round trip is 175 miles long. (2) from B to A the distance is 3/4 of distance from A to B.

Please kindly provide explanations for the following question

Is it C .. ?? I guess it is ..

St1 : Only the total distance. We need total distance and the total fuel consumed.. ---- Insuff.

St2 : AB = x, BA = 3/4x .. That's it what we get from this statement. --- Insuff.

St1 &2 , x+3/4x = 175

AB = 100, BA = 75 and the rest all taken care of .. Suff..

To find average gas/mile we need total miles and total gas consumed we already have averages for individual trips AB : 20 miles/gallon BA : 25 miles/gallon

Statement 1 : Gives total mile but no info on total gas insuff. statement 2 : Gives relation between miles not much info to find required average Both together : Let AB=x BA=y so y=3/4x x+y=175 we have independent averages so we can find total from this info.

From A to B, 20 miles per gallon of gas; from B to A, different route, 25 miles per gallon of gas. What is the average gas per mile for the round trip? (1) round trip is 175 miles long. (2) from B to A the distance is 3/4 of distance from A to B.

Please kindly provide explanations for the following question

Must be C. this was my initial answer in the begining. However, being a GMAT problem I double checked S2.

Just use the miles from S1: 175. we get AB=100 and BA=75.

Use another one 140 miles. we get AB=80 and BA=60.

Stmt2: let's say the AB = s BA = 3/4 s Average gas per mile for the round trip = total miles/total gas consumed total miles = s + 3/4 s total gas = s/20 + 3/4 s/25 we can calculate the average gas per mile from the give info as 's' will cancel out from numerator and denominator. hence suff

Stmt2: let's say the AB = s BA = 3/4 s Average gas per mile for the round trip = total miles/total gas consumed total miles = s + 3/4 s total gas = s/20 + 3/4 s/25 we can calculate the average gas per mile from the give info as 's' will cancel out from numerator and denominator. hence suff

I did C but vshaunak’s answer sounds intriguing. What is the OA?

From A to B, 20 miles per gallon of gas; from B to A, different route, 25 miles per gallon of gas. What is the average gas per mile for the round trip? (1) round trip is 175 miles long. (2) from B to A the distance is 3/4 of distance from A to B.

Please kindly provide explanations for the following question

average gas per mile for the round trip = Tot distance/Tot nos of gallons of gas used

1.gives distance but does not get info about amount of gas consumed ->INSUFF 2. let d be dist between A nd B 20 = d/g1 , 25 = .75 d/g2

g1 = d/20, g2 = .75d/25

Tot distance = 1.75d

Tot nos of gallons of gas used = g1+g2 =d/20+ .75d/25

From A to B, 20 miles per gallon of gas; from B to A, different route, 25 miles per gallon of gas. What is the average gas per mile for the round trip? (1) round trip is 175 miles long. (2) from B to A the distance is 3/4 of distance from A to B.

Average gas per mile = (volume of gas from A to B + volume of gas from B to A)/(distance from A to B + distance from B to A). (1) is insuff. (2) let the distantce from A to B as d1, then d1/20 gallon of gas; let the distantce from B to A as d2, d2= 3d1/4/25=3d1/100 gallon of gas. The average is (d1/20+3d1/100)/(d1+3d1/4)=8/175. SUFF