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M19-28

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Joined: 02 Sep 2009
Posts: 42269

Kudos [?]: 132809 [0], given: 12376

M19-28 [#permalink]

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New post 16 Sep 2014, 01:06
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E

Difficulty:

  45% (medium)

Question Stats:

75% (01:15) correct 25% (01:35) wrong based on 115 sessions

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At 15:00 there were 20 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 8 students left the lab, how many students were in the computer lab at 15:44 ?

A. 7
B. 14
C. 25
D. 27
E. 30
[Reveal] Spoiler: OA

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Kudos [?]: 132809 [0], given: 12376

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Joined: 02 Sep 2009
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Kudos [?]: 132809 [1], given: 12376

Re M19-28 [#permalink]

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New post 16 Sep 2014, 01:06
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Official Solution:

At 15:00 there were 20 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 8 students left the lab, how many students were in the computer lab at 15:44 ?

A. 7
B. 14
C. 25
D. 27
E. 30

During the 44 minutes between 15:00 and 15:44 \(\frac{42}{3} = 14\) groups, 3 students each, entered the lab and \(\frac{40}{10} = 4\) groups, 8 students each, left the lab. Thus, the number of students in the lab grew by \(14*3 - 8*4 = 10\).

Answer: E
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

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Re M19-28 [#permalink]

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New post 12 Aug 2017, 02:41
I think this is a high-quality question and I agree with explanation. in love with this question. AMAZING
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Re: M19-28 [#permalink]

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New post 08 Oct 2017, 23:20
This is a high quality question.

Posted from my mobile device

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Re: M19-28   [#permalink] 08 Oct 2017, 23:20
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