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

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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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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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SOLUTION

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

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

Convert the fractions into the decimals:

\(\frac{3}{100} + \frac{5}{1,000} + \frac{7}{100,000} =0.03+0.005+0.00007=0.03507\).

Answer: E.
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Re: 3/10 + 5/1,00 + 7/100,000 = [#permalink]
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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\(\frac{3}{100} + \frac{5}{1,000} + \frac{7}{100,000}\)

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

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

= 0.03507

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

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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]
0.03+0.005+0.00007=0.03507

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

Solution :

Make the denominator common with greatest denominator= 7/100,000 = 7 x 10^-5 ---A

3/100 can be expressed as 3 x 10^3 / 10^-5 = 3000/10^-5 -----B

5/1000 can be expressed as 5 x 10^2/ 10^-5 = 500/10^-5 ---- C

A+ B+ C ---> (3000+500+7)/10^-5 = 3507/10^-5

=.03507

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


\(\frac{3}{100} + \frac{5}{1,000} + \frac{7}{100,000} = \frac{(3000 + 500 + 7)}{100,000} = \frac{3507}{100,000} = .03507\)

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


In \(\frac{3}{100} + \frac{5}{1,000} + \frac{7}{100,000}\)
\(\frac{3}{100}\) shows that 0.03 must be there.
Hence A, B and C are out.
\(\frac{7}{100,000}\) has 7 at \(5^{th}\) place after decimal.

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