It is currently 16 Dec 2018, 21:02

### 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

# In the sequence of numbers

Author Message
TAGS:
Moderator
Joined: 18 Apr 2015
Posts: 5199
Followers: 77

Kudos [?]: 1048 [0], given: 4690

In the sequence of numbers [#permalink]  15 May 2018, 10:51
Expert's post
00:00

Question Stats:

100% (00:35) correct 0% (00:00) wrong based on 4 sessions
In the sequence of numbers $$x_1, x_2, x_3, x_4, x_5,$$ each number after the first is twice the preceding number. If $$x_5 - x_1$$ is 20, what is the value of $$x_1$$ ?

A. $$\frac{4}{3}$$

B. $$\frac{5}{4}$$

C. $$2$$

D. $$\frac{5}{2}$$

E. $$4$$
[Reveal] Spoiler: OA

_________________
Director
Joined: 07 Jan 2018
Posts: 555
Followers: 4

Kudos [?]: 482 [1] , given: 84

Re: In the sequence of numbers [#permalink]  16 May 2018, 06:13
1
KUDOS
From the question,

x1 = x1
x2 = 2x1
x3 = 4x1
x4 = 8x1
x5 = 16x1

Also x5 -x1 = 20; we can rewrite it as:

16x1 - x1 = 20
or, 15x1 = 20
therefore x1 = $$\frac{20}{15}$$ which reduces to $$\frac{4}{3}$$
option A
_________________

This is my response to the question and may be incorrect. Feel free to rectify any mistakes

Re: In the sequence of numbers   [#permalink] 16 May 2018, 06:13
Display posts from previous: Sort by

# In the sequence of numbers

 Powered by phpBB © phpBB Group Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.