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Members of a social club met to address 280 newsletters. If

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Members of a social club met to address 280 newsletters. If [#permalink]

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The Official Guide For GMAT® Quantitative Review, 2ND Edition

Members of a social club met to address 280 newsletters. If they addressed 1/4 of the newsletters during the first hour and 2/5 of the remaining newsletters during the second hour, how many newsletters did they address during the second hour?

(A) 28
(B) 42
(C) 63
(D) 84
(E) 112

Problem Solving
Question: 59
Category: Arithmetic Operations on rational numbers
Page: 69
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 24 Jan 2014, 03:57
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SOLUTION

Members of a social club met to address 280 newsletters. If they addressed 1/4 of the newsletters during the first hour and 2/5 of the remaining newsletters during the second hour, how many newsletters did they address during the second hour?

(A) 28
(B) 42
(C) 63
(D) 84
(E) 112

1/4 of the newsletters were addressed during the first hour, thus 3/4 of the newsletters were NOT addressed during the first hour, which means that 3/4*280 = 210 were NOT addressed during the first hour. Therefore, 2/5*210 = 84 newsletters were addressed during the second hour.

Answer: D.
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Resources:
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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.


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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 24 Jan 2014, 05:45
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KUDOS
Newsletters during first hour = 0.25 * 280 = 70. So remaining is 210.
2/5 of 210 = 420/5 = 84. So answer is (D).

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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 25 Jan 2014, 21:36
During first hour,letters addressed=280*1/4=70
Remaining=280-70=210
During second hour=210*2/5=42*2=84
Ans.D

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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 25 Jan 2014, 22:44
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

Members of a social club met to address 280 newsletters. If they addressed 1/4 of the newsletters during the first hour and 2/5 of the remaining newsletters during the second hour, how many newsletters did they address during the second hour?

(A) 28
(B) 42
(C) 63
(D) 84
(E) 112



3/4 of the newsletters were not addressed during the first hour. 2/5 of those 3/4 newsletters were addressed during the second hour.

Newsletters addressed = 280*3/4*2/5 = 84

Option D

Difficulty level 550 is OK.
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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 29 Jul 2016, 10:54
in the first hour => 1/4*280=>70
left =210
in the second hour => 2/5*210=84
Smash D
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Re: Members of a social club met to address 280 newsletters. If [#permalink]

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New post 11 Nov 2017, 00:42
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Members of a social club met to address 280 newsletters. If   [#permalink] 11 Nov 2017, 00:42
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