Could somebody help me with this one?
2oth board counting from the top is immediately below the 16 th board counting from the bottom. How many board members are there?
answer: 34
Thank you so much!!
board counting from top and bottom
This topic has expert replies
-
- Junior | Next Rank: 30 Posts
- Posts: 23
- Joined: Fri Jun 18, 2010 10:26 am
- Followed by:1 members
- amising6
- Master | Next Rank: 500 Posts
- Posts: 294
- Joined: Wed May 05, 2010 4:01 am
- Location: india
- Thanked: 57 times
nowenriqueta26 wrote:Could somebody help me with this one?
2oth board counting from the top is immediately below the 16 th board counting from the bottom. How many board members are there?
answer: 34
Thank you so much!!
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19 16
20 15 so this 2 are overlappin so we will have 20+16-2 =34
14
13
12
11
10
9
8
7
6
5
4
3
Ideation without execution is delusion
- Patrick_GMATFix
- GMAT Instructor
- Posts: 1052
- Joined: Fri May 21, 2010 1:30 am
- Thanked: 335 times
- Followed by:98 members
Hi enriqueta,
Building the model as amising did is one way to do this question. On the test you don't actually have to draw all the boards of course. Solving requires little more than careful step by step.
An alternative is to think through it logically.
20th from top is below the 16th from bottom means that the 16th from the bottom is actually the 19th from top
The 18th from top must be the 17th from bottom
The 17th from top must be the 18th from bottom
. . .
. . .
. . .
1st from top must be the 34th from bottom.
There are 34 boards.
An illustrated solution as well as a step by step video solution is available at GMATPrep Question 1413
Good luck,
-Patrick
Building the model as amising did is one way to do this question. On the test you don't actually have to draw all the boards of course. Solving requires little more than careful step by step.
An alternative is to think through it logically.
20th from top is below the 16th from bottom means that the 16th from the bottom is actually the 19th from top
The 18th from top must be the 17th from bottom
The 17th from top must be the 18th from bottom
. . .
. . .
. . .
1st from top must be the 34th from bottom.
There are 34 boards.
An illustrated solution as well as a step by step video solution is available at GMATPrep Question 1413
Good luck,
-Patrick
- Check out my site: GMATFix.com
- To prep my students I use this tool >> (screenshots, video)
- Ask me about tutoring.
-
- Junior | Next Rank: 30 Posts
- Posts: 23
- Joined: Fri Jun 18, 2010 10:26 am
- Followed by:1 members
- Patrick_GMATFix
- GMAT Instructor
- Posts: 1052
- Joined: Fri May 21, 2010 1:30 am
- Thanked: 335 times
- Followed by:98 members
You're so welcome!
- Check out my site: GMATFix.com
- To prep my students I use this tool >> (screenshots, video)
- Ask me about tutoring.
- shashank.ism
- Legendary Member
- Posts: 1022
- Joined: Mon Jul 20, 2009 11:49 pm
- Location: Gandhinagar
- Thanked: 41 times
- Followed by:2 members
Shortest soln. could be this..U have to just visualize in mind...
20th board from top is immediately below 16th board from bottom
i.e. 20th board from top is 15th board from bottom.
so there are 14 board below 20th from top.. Total = 20 +14 = 34.
20th board from top is immediately below 16th board from bottom
i.e. 20th board from top is 15th board from bottom.
so there are 14 board below 20th from top.. Total = 20 +14 = 34.
My Websites:
www.mba.webmaggu.com - India's social Network for MBA Aspirants
www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.
www.dictionary.webmaggu.com - A compact free online dictionary with images.
Nothing is Impossible, even Impossible says I'm possible.
www.mba.webmaggu.com - India's social Network for MBA Aspirants
www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.
www.dictionary.webmaggu.com - A compact free online dictionary with images.
Nothing is Impossible, even Impossible says I'm possible.