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

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Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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New post 28 Feb 2019, 00:05
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Question Stats:

65% (01:11) correct 35% (01:33) wrong based on 42 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.

I. Add x
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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Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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New post 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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Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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New post 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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Re: Alejandro calculated 25 percent of x instead of a 25 percent increase  [#permalink]

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New post 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.

I. Add x
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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Re: Alejandro calculated 25 percent of x instead of a 25 percent increase   [#permalink] 28 Feb 2019, 06:36
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Alejandro calculated 25 percent of x instead of a 25 percent increase

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