It is currently 22 Jan 2022, 07:18 |

Customized

for You

Track

Your Progress

Practice

Pays

- Jan
**23**### Greenlight Test Prep Free Content

08:00 PM PST

-09:00 PM PST

Greenlight Test Prep - Free Content Regardless of whether you choose to study with Greenlight Test Prep, I believe you'll benefit from my many free resources. - Jan
**23**### Free GRE Prep Hour with Manhattan Prep

08:00 PM EST

-09:00 PM EST

Strategies and techniques for approaching featured GRE topics, 1-hour of live, online instruction - Jan
**25**### Boost Your GRE Score!

07:00 PM PST

-09:00 PM PST

Join ScholarDen for their Guaranteed GRE Score Improvement! Plans starting at $19 per month. - Jan
**28**### GRE Success with ScholarDen

08:00 PM PST

-10:00 PM PST

Read about this users success story with ScholarDen. They helped make his GRE Prep Journey easier. Hear from past users and their GRE Prep Journey's - Jan
**31**### How Do the Best GRE Tutors Help You Improve Your GRE Score?

06:00 PM PST

-07:00 PM PST

If you want to improve your GRE score, you have many options at your disposal. You can self-study using free or extremely low-cost GRE prep materials from ETS, invest in a slightly more expensive self-paced GRE course, and more.

A number line is divided by 10 evenly spaced tick marks.
[#permalink]
10 Jan 2018, 07:42

1

Question Stats:

A number line is divided by 10 evenly spaced tick marks. The length between each tick mark equals p, and p is a prime number.

Indicate all the possible lengths of the number line described above.

A- 10

B- 18

C- 22

D- 24

E- 27

F- 30

G- 36

H- 117

I- 130

Indicate all the possible lengths of the number line described above.

A- 10

B- 18

C- 22

D- 24

E- 27

F- 30

G- 36

H- 117

I- 130

Re: A number line is divided by 10 evenly spaced tick marks.
[#permalink]
10 Jan 2018, 11:17

2

Expert Reply

sameer93 wrote:

A number line is divided by 10 evenly spaced tick marks. The length between each tick mark equals p, and p is a prime number.

Indicate all the possible lengths of the number line described above.

A- 10

B- 18

C- 22

D- 24

E- 27

F- 30

G- 36

H- 117

I- 130

Indicate all the possible lengths of the number line described above.

A- 10

B- 18

C- 22

D- 24

E- 27

F- 30

G- 36

H- 117

I- 130

What's the source of this question?

I ask because I don't understand why B, D and E aren't among the answers.

If p = 3, then the measurements are 3, 6, 9, 12, 15, 18, 21, 24, 27 etc

Cheers,

Brent

_________________

Retired Moderator

Joined: **07 Jun 2014 **

Posts: **4804**

WE:**Business Development (Energy and Utilities)**

Re: A number line is divided by 10 evenly spaced tick marks.
[#permalink]
10 Jan 2018, 18:46

2

Expert Reply

1

Bookmarks

There are 10 evenly spaced tick marks on a line. Say X is a tick mark.

X....X....X....X....X....X....X....X....X....X

So there are 9 spaces between the tick marks. If one space is length l. Then the length of line is \(9 \times l\).

All the options that are multiples of 9 are correct. Except 36 because 36/9 is 4 which is not aprime number

Namely B, E and H

As Brent pointed out the answer seems to be a bit off. Or I misunderstood the question.

_________________

X....X....X....X....X....X....X....X....X....X

So there are 9 spaces between the tick marks. If one space is length l. Then the length of line is \(9 \times l\).

All the options that are multiples of 9 are correct. Except 36 because 36/9 is 4 which is not aprime number

Namely B, E and H

As Brent pointed out the answer seems to be a bit off. Or I misunderstood the question.

_________________

Sandy

If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Re: A number line is divided by 10 evenly spaced tick marks.
[#permalink]
14 Jun 2019, 20:54

sandy wrote:

There are 10 evenly spaced tick marks on a line. Say X is a tick mark.

X....X....X....X....X....X....X....X....X....X

So there are 9 spaces between the tick marks. If one space is length l. Then the length of line is \(9 \times l\).

All the options that are multiples of 9 are correct. Except 36 because 36/9 is 4 which is not aprime number

Namely B, E and H

As Brent pointed out the answer seems to be a bit off. Or I misunderstood the question.

X....X....X....X....X....X....X....X....X....X

So there are 9 spaces between the tick marks. If one space is length l. Then the length of line is \(9 \times l\).

All the options that are multiples of 9 are correct. Except 36 because 36/9 is 4 which is not aprime number

Namely B, E and H

As Brent pointed out the answer seems to be a bit off. Or I misunderstood the question.

I am at one with this explanation, because the number line has 10 evenly spaced TICK MARKs ( NOT evenly spaced GAPs).

therefore, we have 9 GAPS* any prime number= our answers.

Re: A number line is divided by 10 evenly spaced tick marks.
[#permalink]
28 Jun 2019, 14:12

I might be wrong. Here is my explanation. As we got total length will be 9P. P is a prime number, so we should check all prime numbers multiplied by 9. 9*1 won't work since 1 is not a prime number. So those numbers only divisible by 9 shouldn't be our answers. 9*2 works, so any numbers divisible by 18 will be answers. We get B, G. 9*3 will work. So numbers divisible by 27 will be our answers. We get E. I don't see any possible answers here when 9 is multiplied by prime numbers. So, B, E, G my answers. Please enlighten me!!!

Re: A number line is divided by 10 evenly spaced tick marks.
[#permalink]
07 Nov 2021, 10:34

1

Bookmarks

Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

gmatclubot

Moderators:

Multiple-choice Questions — Select One or More Answer Choices |
||