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The sum of all the even integers from 18 to 36 inclusive

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Kudos [?]: 1613 [1] , given: 375

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The sum of all the even integers from 18 to 36 inclusive [#permalink] New post 24 Mar 2018, 02:23
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Question Stats:

35% (00:23) correct 64% (00:26) wrong based on 14 sessions
Quantity A
Quantity B
The sum of all the even integers from 18 to 36 inclusive
The sum of all the even integers from 22 to 38 inclusive


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

Drill 1
Question: 6
Page: 547
[Reveal] Spoiler: OA

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Intern
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Joined: 20 Dec 2017
Posts: 30
Followers: 0

Kudos [?]: 16 [0], given: 9

Re: The sum of all the even integers from 18 to 36 inclusive [#permalink] New post 25 Mar 2018, 10:44
sandy wrote:
Quantity A
Quantity B
The sum of all the even integers from 18 to 36 inclusive
The sum of all the even integers from 22 to 38 inclusive


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

Drill 1
Question: 6
Page: 547


Is there any way to solve this quest under 30 sec?
Also, my favorite short cut doesn't work here (which is Sum=average*#)
1 KUDOS received
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1613 [1] , given: 375

CAT Tests
Re: The sum of all the even integers from 18 to 36 inclusive [#permalink] New post 28 Mar 2018, 13:32
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Explanation

Even if you know the summation formula, you can avoid a lot of time-consuming calculation by disregarding the numbers that are common to both sums—the even integers
from 22 to 36, inclusive.

That leaves 18 + 20 = 38 as the sum of the unique terms in Quantity A, and 38 as the only unique term in Quantity B. The quantities are equal.
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Sandy
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Re: The sum of all the even integers from 18 to 36 inclusive   [#permalink] 28 Mar 2018, 13:32
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