GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 11 Nov 2019, 17:22 ### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  # Jack was asked by her teacher to subtract 3 from a certain number and

Author Message
TAGS:

### Hide Tags

Retired Moderator V
Joined: 27 Oct 2017
Posts: 1268
Location: India
GPA: 3.64
WE: Business Development (Energy and Utilities)
Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags 00:00

Difficulty:   15% (low)

Question Stats: 97% (01:12) correct 3% (02:07) wrong based on 34 sessions

### HideShow timer Statistics

GMATbuster's Weekly Quant Quiz#8 Ques #3

Jack 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

_________________
Current Student S
Joined: 04 Jun 2018
Posts: 156
GMAT 1: 610 Q48 V25 GMAT 2: 690 Q50 V32 GMAT 3: 710 Q50 V36 Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

Working backwards
43*3+9=138

Now 138-3=135/9=15

Hence ans=15 A
Intern  B
Joined: 30 Apr 2018
Posts: 12
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

Answer is option A: i.e. 15
NUS School Moderator V
Joined: 18 Jul 2018
Posts: 1018
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

Let the certain number be x.

Now the correct way is (x-3)/9
but she did (x-9)/3 and got 43
Then x = 138
substituting this in (x-3)/9 = 135/9 = 15

_________________
Press +1 Kudos If my post helps!
Intern  B
Joined: 30 Apr 2018
Posts: 12
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

(x-9)/3 =43
So, x = 138.

Using x in:
(x-3)/9
Intern  B
Joined: 23 May 2018
Posts: 18
Location: India
Concentration: Economics, Strategy
GMAT 1: 690 Q48 V36 GPA: 4
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

Let the number be x.

Now Jack subtracted 9 from the the number and then divided by 3 to result in 43.
This can be written as : (x-9)/3=43
=> x-9=129
=> x=138.

So, the number is 138 and Jack was asked to subtract 3 and divide by 9.
Her correct answer should have been => (x-3)/9 = (138-3)/9 = 135/9 = 15.

Hence, A) 15.
RC Moderator V
Joined: 24 Aug 2016
Posts: 781
GMAT 1: 540 Q49 V16 GMAT 2: 680 Q49 V33 Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

1
Say the actual number was x .
So 43*3+9 = x
or x=138

SO, in the correct way the result should have been = (138-3)/9 =135/9 = 15 Hence , Ans A
_________________
Please let me know if I am going in wrong direction.
Thanks in appreciation.
Director  G
Joined: 19 Oct 2013
Posts: 511
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

(X-9) / 3 = 43

X= 129 + 9 = 138

(X-3) / 9 = 135 / 9 = 15

Posted from my mobile device
Senior Manager  D
Joined: 05 Jul 2018
Posts: 462
Location: India
Concentration: General Management, Technology
GMAT 1: 600 Q47 V26 GRE 1: Q162 V149 GPA: 3.6
WE: Information Technology (Consulting)
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

1
she did the following to the original number X

=$$\frac{(X-9)}{3=43}$$

=$$x-9=129$$

=$$x=138$$

The actual calculation was
=$$\frac{(X-3)}{9}$$

=$$\frac{(135)}{9}$$

_________________
Appreciate any KUDOS given ! MY MBA RESOURCES:

4000 Official Verbal Question | 3700 Official quant questions

Intern  B
Joined: 09 Nov 2018
Posts: 26
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

Let x be the number
Intended calculation
(x-3)/9
Performed calculation=43
(x-9)/3=43
x=138

sub x in intended calculation
(x-3)/9 = (135/9)=15

option A
Intern  B
Joined: 31 Oct 2018
Posts: 17
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

let the number be x

(x-9)/3=43
x=138

As per correct calculation , it should be (x-3)/9 = 135/9=15
Manager  S
Joined: 24 Dec 2017
Posts: 184
Location: India
Concentration: Strategy, Real Estate
Schools: Johnson '21
Re: Jack was asked by her teacher to subtract 3 from a certain number and  [#permalink]

### Show Tags

=> x - 3/9 = 43
=> x - 9 = 129
=> x = 129 + 9
=> x = 138

138 - 3 = 135/9 = 15 Re: Jack was asked by her teacher to subtract 3 from a certain number and   [#permalink] 11 Nov 2018, 00:34
Display posts from previous: Sort by

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