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3/10 + 5/1,00 + 7/100,000 =

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Math Expert
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Joined: 02 Sep 2009
Posts: 50543
3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 08 Jan 2014, 06:10
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

81% (00:59) correct 19% (00:56) wrong based on 709 sessions

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

3/100 + 5/1,000 + 7/100,000 =

(A) 0.357
(B) 0.3507
(C) 0.35007
(D) 0.0357
(E) 0.03507

Problem Solving
Question: 27
Category: Arithmetic Operations on rational numbers
Page: 65
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: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 08 Jan 2014, 06:10
2
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 08 Jan 2014, 20:37
1
One way to do this problem:

3*10^-1 + 5*10^-2 + 7*10^-5
= 0.3+0.05+0.00007
= 0.35007

(OR)

Alternate approach would be like this if you do not prefer handling decimals:
(30,000+5000+7)/10^5
= 35007/10^5
= 0.35007

Ans is (C).
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 08 Jan 2014, 22:10
2
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

3/10 + 5/1,00 + 7/100,000 =

(A) 0.357
(B) 0.3507
(C) 0.35007
(D) 0.0357
(E) 0.03507

Problem Solving
Question: 27
Category: Arithmetic Operations on rational numbers
Page: 65
Difficulty: 600


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

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!




count the no of zeros(n) in the denominator and write the number in the numerator in the digit after the decimal after (n-1) zeros
.35007
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 10 Jan 2014, 09:36
1
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

3/10 + 5/1,00 + 7/100,000 =

(A) 0.357
(B) 0.3507
(C) 0.35007
(D) 0.0357
(E) 0.03507


3/100 = 0.03 so options D and E can only be considered.

Between denominator of 5 and 7, one of them is 100 times of the other, so there has to be a 0 between 5 and 7. Hence Option E)
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 11 Jan 2014, 05:35
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 11 Jan 2014, 09:48
3/100=.03 (Options A,B & C are out)
5/1000=0.005
7/100000=.00007
Adding we get 0.03507
Ans. E

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  [#permalink]

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New post 07 Aug 2014, 01:28
2
\(\frac{3}{100} + \frac{5}{1,000} + \frac{7}{100,000}\)

\(= \frac{3000}{100,000} + \frac{500}{100,000} + \frac{7}{100,000}\)

\(= \frac{3507}{100,000}\)

= 0.03507

Answer = E
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 07 Aug 2014, 01:39
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

3/100 + 5/1,000 + 7/100,000 =

(A) 0.357
(B) 0.3507
(C) 0.35007
(D) 0.0357
(E) 0.03507

Problem Solving
Question: 27
Category: Arithmetic Operations on rational numbers
Page: 65
Difficulty: 600


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

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!



Bunuel, Kindly update the subject line of this problem. Its showing up Re: 3/10 + 5/1,00 + 7/100,000 =

I ended up doing wrong :(

Thank you :)
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 25 May 2017, 09:46
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

3/100 + 5/1,000 + 7/100,000 =

(A) 0.357
(B) 0.3507
(C) 0.35007
(D) 0.0357
(E) 0.03507

Problem Solving
Question: 27
Category: Arithmetic Operations on rational numbers
Page: 65
Difficulty: 600


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

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


This problem is easy to solve if you stay organized and see the trap in answer choices D/E. In this case, 3/*100 * 1000/1000 = 3000/100,000 + 5/1000 * 100/100 = 500/100,000 + 7/100,000 = 3000+500+7/100,000 = 3507/100,000.

3507/100,000 = 0.03507, so the answer tries to trip you up with answers D/E which have the correct number of zeroes after the decimal place but the wrong middle term in the decimal (D is missing a 0 in the ten thousandths column).
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Re: 3/10 + 5/1,00 + 7/100,000 =  [#permalink]

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New post 07 Sep 2018, 07:33
0.03+0.005+0.00007=0.03507

Answer E
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Re: 3/10 + 5/1,00 + 7/100,000 = &nbs [#permalink] 07 Sep 2018, 07:33
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3/10 + 5/1,00 + 7/100,000 =

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