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## OG-17

tagged by: Brent@GMATPrepNow

This topic has 3 expert replies and 1 member reply
Joy Shaha Senior | Next Rank: 100 Posts
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#### OG-17

Sat Nov 19, 2016 1:13 pm
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
A technician makes a round-trip to and from a certain service center by the
same route. If the technician completes the drive to the center and then
completes 10 percent of the drive from the center, what percent of the
round-trip has the technician completed?
A) 5% B) 10% C) 25% D) 40% E) 55%

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melguy Master | Next Rank: 500 Posts
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Sat Nov 19, 2016 6:52 pm
Let the drive from A to B is 100 Kms

A -> B = 100
B -> A = 100
(Total = 200)

Driver has completed A -> B (100 Kms) + 10% of B -> A (10 Kms)
100+ 10 = 110

How percent has he covered out of the total distance (200 kms)

110
----- X 100
200

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Brent@GMATPrepNow GMAT Instructor
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Sun Nov 20, 2016 5:14 am
Joy Shaha wrote:
A technician makes a round-trip to and from a certain service center by the
same route. If the technician completes the drive to the center and then
completes 10 percent of the drive from the center, what percent of the
round-trip has the technician completed?
A) 5%
B) 10%
C) 25%
D) 40%
E) 55%
We can use the answer choices to our advantage (ALWAYS check the answer choices before performing any calculations - see the General GMAT Math Strategies video below)

The TOTAL distance for the round trip = (distance from home to service center) + (distance from service center to home)
Once the technician drove the distance from home to service center, he/she has completed HALF (50%) of the round trip.

Once the technician drives a portion of distance from service center to home, he/she has completed more than HALF of the round trip.

So, the correct answer is GREATER THAN 50%

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Matt@VeritasPrep GMAT Instructor
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Fri Nov 25, 2016 3:10 pm
I'd hop on the answers here. Since the technician has already traveled at least half of the total trip, he must have gone > 50% of the way.

With that in mind, only E works!

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Scott@TargetTestPrep GMAT Instructor
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Sun Nov 27, 2016 5:50 pm
Joy Shaha wrote:
A technician makes a round-trip to and from a certain service center by the
same route. If the technician completes the drive to the center and then
completes 10 percent of the drive from the center, what percent of the
round-trip has the technician completed?
A) 5% B) 10% C) 25% D) 40% E) 55%
We can let the distance to the center = d, so the roundtrip distance = 2d.

Since the technician has driven to the center and completed 10 percent of the drive home, he has gone d + 0.1d = 1.1d. Thus, the percent completed is:

(1.1d)/(2d) x 100

11/20 x 100 = 11 x 5 = 55 percent.

Alternate solution:

As Brent has already mentioned, after the technician has driven to the center, he or she has completed half, or 50% of the round trip. We know that the technician will drive a bit more, and without doing the math, we see that the only logical answer choice is 55%.

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