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

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Math Expert
Joined: 02 Sep 2009
Posts: 59725
Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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18 Mar 2019, 03:14
00:00

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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Posts: 5483
Location: India
Concentration: Sustainability, Marketing
GPA: 4
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Re: Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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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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Joined: 09 Feb 2019
Posts: 4
Re: Cindy was asked by her teacher to subtract 3 from a certain number and  [#permalink]

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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)
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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