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# Alejandro calculated 25 percent of x instead of a 25 percent increase

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Math Expert
Joined: 02 Sep 2009
Posts: 58339
Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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28 Feb 2019, 00:05
00:00

Difficulty:

35% (medium)

Question Stats:

65% (01:12) correct 35% (01:23) wrong based on 53 sessions

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Alejandro calculated 25 percent of x instead of a 25 percent increase in x. Which of the following operations could Alejandro perform on his answer to produce the correct solution?
Indicate all such values.

II. Divide by 0.25
III. Multiply by 5

A. I only
B. I and II only
C. II and III only
D. I and III only
E. I, II, and III

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Manager
Joined: 31 Dec 2018
Posts: 115
Location: India
Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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28 Feb 2019, 01:09
Wrong Cal=0.25x
Correct Cal=1.25x
Difference=-x
to get same answer, he would have added x to nullify the difference.

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Manager
Joined: 17 May 2018
Posts: 140
Location: India
Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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28 Feb 2019, 01:10
Taking x =100
25% of x= 25
125% of x= 125
So the 25% to 125% change can be made by adding x
Or
By multiplying 25% of x with 5

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GMAT Club Legend
Joined: 18 Aug 2017
Posts: 4986
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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28 Feb 2019, 06:36
let x = 100
so mistake done gets 25 where as it should have been 125

so now he can either add 100 to 25 or multiply by 5
IMO D

Bunuel wrote:
Alejandro calculated 25 percent of x instead of a 25 percent increase in x. Which of the following operations could Alejandro perform on his answer to produce the correct solution?
Indicate all such values.

II. Divide by 0.25
III. Multiply by 5

A. I only
B. I and II only
C. II and III only
D. I and III only
E. I, II, and III
Re: Alejandro calculated 25 percent of x instead of a 25 percent increase   [#permalink] 28 Feb 2019, 06:36
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