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Cindy was asked by her teacher to subtract 3 from a certain number and

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Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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New post 18 Mar 2019, 03:14
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Difficulty:

  15% (low)

Question Stats:

89% (01:30) correct 11% (02:07) wrong based on 19 sessions

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Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9. Instead, she subtracted 9 and then divided the result by 3, giving an answer of 43. What would her answer have been had she worked the problem correctly?

(A) 15
(B) 34
(C) 43
(D) 51
(E) 138

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Re: Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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New post 18 Mar 2019, 03:22
Bunuel wrote:
Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9. Instead, she subtracted 9 and then divided the result by 3, giving an answer of 43. What would her answer have been had she worked the problem correctly?

(A) 15
(B) 34
(C) 43
(D) 51
(E) 138


Cindy did;
A-9=43*3
A= 138
Cindy had to do ; 138-3/9 = 15
IMO A
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Re: Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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New post 18 Mar 2019, 04:19
Bunuel wrote:
Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9. Instead, she subtracted 9 and then divided the result by 3, giving an answer of 43. What would her answer have been had she worked the problem correctly?

(A) 15
(B) 34
(C) 43
(D) 51
(E) 138


By Backtracking

Let the original number is X.
As per incorrect operation
(X-9)/3 = 43
X= 138

Now with correct operational sequence

(138-3)/9 = 15

IMO 15 (A)
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Re: Cindy was asked by her teacher to subtract 3 from a certain number and   [#permalink] 18 Mar 2019, 04:19
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Cindy was asked by her teacher to subtract 3 from a certain number and

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