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(2) The total charge for the call was $2.88. I could not understand or setup an equation for the (1). Please help! _________________ Want to Beat GMAT. Always do what you're afraid to do. Whoooop GMAT ### GMAT/MBA Expert Scott@TargetTestPrep GMAT Instructor Joined 25 Apr 2015 Posted: 675 messages Followed by: 3 members Upvotes: 43 Tue Dec 05, 2017 5:28 pm kanha81 wrote: The charge for a telephone call between City R and City S is$0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call? (1) The charge for the first 3 minutes of the call was$0.36 less than the charge for the remainder of the call.

(2) The total charge for the call was $2.88. We are given that the charge for a telephone call between City R and City S is$0.42 for each of the first 3 minutes and $0.18 for each additional minute. We are also given that a call between the two cities lasted for x minutes. We can create the following equation: 3(0.42) + 0.18(x - 3) = total cost of the call 1.26 + 0.18x - 0.54 = total cost of the call 0.18x + 0.72 = total cost of the call We must determine the value of x. Statement One Alone The charge for the first 3 minutes of the call was$0.36 less than the charge for the remainder of the call.

Using the information in statement one, and from the given information, we can create the following equation:

1.26 = (0.18x - 0.54) - 0.36

0.78 = 0.18x - 0.54

2.16 = 0.18x

x = 12

Statement one alone is sufficient to answer the question. We can eliminate answer choices B, C, and E.

Statement Two Alone

The total charge for the call was 2.88.

Using the information in statement two, and from the given information, we can create the following equation:

0.18x + 0.72 = $2.88 0.18x =$2.16

x = 12

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aj5105 Legendary Member
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Tue Jun 02, 2009 6:29 am
Statement (1) : 1.26 + 0.36 = 0.18 * C [C = each additional minute over 3]

Sufficient

Statement (2) :1.26 + 0.18 * C = 2.88

Sufficient

[D]

brick2009 Master | Next Rank: 500 Posts
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Target GMAT Score:
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Mon Jun 01, 2009 9:32 pm

a.) if X is the total minutes,
(x-3)x18 cent = (3x.42)-.36 ...so you can solve for X

b.) is straight forward

kanha81 Master | Next Rank: 500 Posts
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Mon Jun 01, 2009 11:58 am
mike22629 wrote:
IMO D.

Info in Passage:
.42$per minute for first 3 minutes, so 1.26$ for first 3 minutes.

Statement 1
Since the charge for the first 3 minutes of the call was .36 less than the remainder
Total Cost = 1.26 + (1.26 + .36) = 2.88
1.62/.18 + 3 = total minutes

Notice I did not calculate actual answer because it is not necessary.
Mike,
To be honest, I quite did not get your deduction of total cost. Trivial as it may see, I am not able to understand. Can you please help me understand this?
mike22629 wrote:
Total Cost = 1.26 + (1.26 + .36) = 2.88
1.62/.18 + 3 = total minutes

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Always do what you're afraid to do. Whoooop GMAT

mike22629 Master | Next Rank: 500 Posts
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Posted:
322 messages
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Test Date:
May 26th
GMAT Score:
710
Mon Jun 01, 2009 11:47 am
IMO D.

Info in Passage:
.42$per minute for first 3 minutes, so 1.26$ for first 3 minutes.

Statement 1
Since the charge for the first 3 minutes of the call was .36 less than the remainder
Total Cost = 1.26 + (1.26 + .36) = 2.88
1.62/.18 + 3 = total minutes

Notice I did not calculate actual answer because it is not necessary.

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