GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 02 Jun 2020, 10:21

### 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

# Which of the following is NOT true?

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 64174
Which of the following is NOT true?  [#permalink]

### Show Tags

06 Feb 2020, 08:13
00:00

Difficulty:

25% (medium)

Question Stats:

75% (01:15) correct 25% (01:21) wrong based on 64 sessions

### HideShow timer Statistics

Which of the following is NOT true?

(A) 2.5 is the reciprocal of 0.4.

(B) $$1+\frac{x}{2}$$ is the reciprocal of $$\frac{2}{2+x}$$

(C) $$\frac{xz}{-y}$$ is the reciprocal of $$\frac{y}{-xz}$$

(D) $$\frac{2a}{b}$$ is the reciprocal of $$\frac{b}{0.5a}$$

(E) $$\frac{m}{\frac{7}{8}}$$ is the reciprocal of $$\frac{7}{8m}$$

_________________
GMAT Club Legend
Joined: 18 Aug 2017
Posts: 6305
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: Which of the following is NOT true?  [#permalink]

### Show Tags

07 Feb 2020, 00:27
Bunuel wrote:
Which of the following is NOT true?

(A) 2.5 is the reciprocal of 0.4.

(B) $$1+\frac{x}{2}$$ is the reciprocal of $$\frac{2}{2+x}$$

(C) $$\frac{xz}{-y}$$ is the reciprocal of $$\frac{y}{-xz}$$

(D) $$\frac{2a}{b}$$ is the reciprocal of $$\frac{b}{0.5a}$$

(E) $$\frac{m}{\frac{7}{8}}$$ is the reciprocal of $$\frac{7}{8m}$$

IMO D; $$\frac{2a}{b}$$ is the reciprocal of $$\frac{b}{0.5a}$$
not true option
GMAT Club Legend
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 4046
Location: India
GMAT: QUANT EXPERT
Schools: IIM (A)
GMAT 1: 750 Q51 V41
WE: Education (Education)
Which of the following is NOT true?  [#permalink]

### Show Tags

07 Feb 2020, 00:45
1
Bunuel wrote:
Which of the following is NOT true?

(A) 2.5 is the reciprocal of 0.4.

(B) $$1+\frac{x}{2}$$ is the reciprocal of $$\frac{2}{2+x}$$

(C) $$\frac{xz}{-y}$$ is the reciprocal of $$\frac{y}{-xz}$$

(D) $$\frac{2a}{b}$$ is the reciprocal of $$\frac{b}{0.5a}$$

(E) $$\frac{m}{\frac{7}{8}}$$ is the reciprocal of $$\frac{7}{8m}$$

Let's check them using options

(A) 2.5 is the reciprocal of 0.4. reciprocal of 0.4 = 1/0.4 = 10/4 = 5/2 = 2.5 i.e. TRUE

(B) $$1+\frac{x}{2}$$ is the reciprocal of $$\frac{2}{2+x}$$ reciprocal of $$\frac{2}{2+x}=\frac{2+x}{2} = (2/2)+(x/2) = 1+\frac{x}{2}$$ TRUE

(C) $$\frac{xz}{-y}$$ is the reciprocal of $$\frac{y}{-xz}$$ reciprocal of $$\frac{y}{-xz} = \frac{xz}{-y} TRUE$$

(D) $$\frac{2a}{b}$$ is the reciprocal of $$\frac{b}{0.5a}$$ reciprocal of $$\frac{b}{0.5a}$$ = $$0.5a/b = \frac{a}{2b} FALSE$$

(E) $$\frac{m}{\frac{7}{8}}$$ is the reciprocal of $$\frac{7}{8m}$$

_________________
Prosper!!!
GMATinsight .............(Bhoopendra Singh and Dr.Sushma Jha)
e-mail: info@GMATinsight.com l Call : +91-9999687183 / 9891333772
One-on-One Skype classes l Classroom Coaching l On-demand Quant course l Admissions Consulting
Check website for most affordable Quant on-Demand course 2000+ Qns (with Video explanations)
Our SUCCESS STORIES: From 620 to 760 l Q-42 to Q-49 in 40 days l 590 to 710 + Wharton l
ACCESS FREE GMAT TESTS HERE:22 FREE (FULL LENGTH) GMAT CATs LINK COLLECTION
Manager
Joined: 22 Jan 2020
Posts: 54
Re: Which of the following is NOT true?  [#permalink]

### Show Tags

13 Feb 2020, 13:57
(E) m78m78 is the reciprocal of 78m78m

can someone do the math with this? I don't understand when there are 2 numerators and 1 denomenator or 1 denomenator and 2 numerators?
Re: Which of the following is NOT true?   [#permalink] 13 Feb 2020, 13:57