Using specific numbers to achieve a certain number

Expert replies

yash188: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sat Dec 12, 2015 11:00 amFollowed by: 1 member; Thanked: 1 times

by yash188 » Sat Dec 12, 2015 11:03 am

Hi,

This might be a really dumb question or maybe not but i am really stuck on this.
I am trying to achieve the number 13 using the numbers 3,5,6,7.
I have all the numbers starting from 1 to 20 except 13.
We can use any arithmetic operation to achieve the desired result.
Could someone help me with this?

Like this post

Source: Beat The GMAT — Problem Solving | Sat Dec 12, 2015 11:03 am

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Dec 12, 2015 11:14 am

yash188 wrote:Hi,

This might be a really dumb question or maybe not but i am really stuck on this.
I am trying to achieve the number 13 using the numbers 3,5,6,7.
I have all the numbers starting from 1 to 20 except 13.
We can use any arithmetic operation to achieve the desired result.
Could someone help me with this?

This isn't a GMAT-style question (what are the 5 answer choices?), plus it's unclear what you're trying to accomplish. Does one have to use all four numbers?

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

yash188: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sat Dec 12, 2015 11:00 amFollowed by: 1 member; Thanked: 1 times

by yash188 » Sat Dec 12, 2015 11:18 am

Yeah I know its not a GMAT style question, but i really suck at mathematics and wanted to develop some sort of number sense before delving into the actual questions.
I found this on a Magoosh blog and wanted to try it out. The aim is to achieve numbers from 1-20 using any random 4 single digit numbers which can only be used once.

For example, to get 4 using the numbers 3,5,6,7 the following operation can be done:
7-3/6-5 = 4.

There are no options and yes we have to use all 4 numbers.

Like this post

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Dec 12, 2015 11:36 am

How about (73 + 5)/6 = 13

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

yash188: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sat Dec 12, 2015 11:00 amFollowed by: 1 member; Thanked: 1 times

by yash188 » Sat Dec 12, 2015 11:43 am

I am not sure if we are allowed to bunch numbers together or not. But I am good with it because i am pretty sure i have tried everything else

Thanks a lot Brent!!

Like this post

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Dec 12, 2015 11:45 am

Yeah, I wondered if that was against the "rules" as well.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

Like this post

yash188: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sat Dec 12, 2015 11:00 amFollowed by: 1 member; Thanked: 1 times

by yash188 » Sat Dec 12, 2015 11:48 am

Yeah me too since all the other 19 numbers were achieved using only arithmetic operations. And i was able to get all the 20 numbers for many other random sets of 4 single digit numbers.

But thank you for the help. I only asked when i was unable to figure this out for hours.

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review