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# 1/19 - 1

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Founder
Joined: 18 Apr 2015
Posts: 12123
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Kudos [?]: 3028 [0], given: 11297

1/19 - 1 [#permalink]  06 Sep 2018, 16:12
Expert's post
00:00

Question Stats:

69% (00:18) correct 30% (00:33) wrong based on 68 sessions
 Quantity A Quantity B $$\frac{1}{19} - 1$$ $$\frac{1}{18} - 1$$

A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given

Kudos for the right answer and solution.
[Reveal] Spoiler: OA

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GRE Instructor
Joined: 10 Apr 2015
Posts: 3535
Followers: 134

Kudos [?]: 4020 [1] , given: 65

Re: 1/19 - 1 [#permalink]  07 Sep 2018, 05:35
1
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Expert's post
Carcass wrote:
 Quantity A Quantity B $$\frac{1}{19} - 1$$ $$\frac{1}{18} - 1$$

A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given

Kudos for the right answer and solution.

We can solve this question using matching operations

Given:
Quantity A: 1/19 - 1
Quantity B: 1/18 - 1

Quantity A: 1/19
Quantity B: 1/18

At this point, we might recognize that 1/18 is greater than 1/19.

However, we can also continue using matching operations

Multiply both quantities by 19 to get:
Quantity A: 1
Quantity B: 19/18

Quantity B is still bigger!

Multiply both quantities by 18 to get:
Quantity A: 18
Quantity B: 19

Yep, Quantity B is must be bigger

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Re: 1/19 - 1   [#permalink] 07 Sep 2018, 05:35
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