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The percentage of integers from 1 through 100 whose squares end with

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Director
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Joined: 31 Oct 2013
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Concentration: Accounting, Finance
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The percentage of integers from 1 through 100 whose squares end with  [#permalink]

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New post Updated on: 09 Sep 2018, 21:03
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

56% (01:56) correct 44% (01:31) wrong based on 25 sessions

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The percentage of integers from 1 through 100 whose squares end with the digit 1 is x% and the percentage of integers from 1 through 200 whose squares end with 1 is y%. Which one of the following is true?

A) x=y
B) X = 2y
C) X = 4y
D) y = 2x
E) y = 4x

Originally posted by selim on 09 Sep 2018, 20:47.
Last edited by selim on 09 Sep 2018, 21:03, edited 2 times in total.
Intern
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Schools: ESMT
GMAT 1: 700 Q44 V44
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Re: The percentage of integers from 1 through 100 whose squares end with  [#permalink]

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New post 09 Sep 2018, 20:58
Numbers between 1 - 100 whose square ends in 1 is 20 - 1,9,11,19......91,99 -> 20 -> %of such numbers out of 100 = 20/100 -> 20%

Such numbers between 1 - 200 - 40 -> % -> 40/200 -> 20%

Hence Option A
Intern
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Joined: 05 Jun 2018
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Re: The percentage of integers from 1 through 100 whose squares end with  [#permalink]

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New post 09 Sep 2018, 21:01
1
mitusingla wrote:
Numbers between 1 - 100 whose square ends in 1 is 20 - 1,9,11,19......91,99 -> 20 -> %of such numbers out of 100 = 20/100 -> 20%

Such numbers between 1 - 200 - 40 -> % -> 40/200 -> 20%

Hence Option A


I used the same approach, and also concluded that the answer is A. But, the OA listed is E.

Any thoughts?

Posted from my mobile device
Director
Director
User avatar
G
Joined: 31 Oct 2013
Posts: 577
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: The percentage of integers from 1 through 100 whose squares end with  [#permalink]

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New post 09 Sep 2018, 21:04
hastee wrote:
mitusingla wrote:
Numbers between 1 - 100 whose square ends in 1 is 20 - 1,9,11,19......91,99 -> 20 -> %of such numbers out of 100 = 20/100 -> 20%

Such numbers between 1 - 200 - 40 -> % -> 40/200 -> 20%

Hence Option A


I used the same approach, and also concluded that the answer is A. But, the OA listed is E.

Any thoughts?

Posted from my mobile device



Edited. Thank u .

The correct answer is A.
Re: The percentage of integers from 1 through 100 whose squares end with &nbs [#permalink] 09 Sep 2018, 21:04
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