Q20

User avatar
 
ManhattanPrepLSAT2
Thanks Received: 291
Atticus Finch
Atticus Finch
 
Posts: 303
Joined: July 14th, 2009
 
 
 

Q20

by ManhattanPrepLSAT2 Thu Oct 27, 2011 4:52 pm

Here are two possible solutions for this problem -- one for if you used frames, one for if you did not.
Attachments
Slide2.jpg
Without frames
(55.59 KiB) Downloaded 506 times
Slide1.jpg
With frames
(61.91 KiB) Downloaded 414 times
 
jthor81
Thanks Received: 0
Vinny Gambini
Vinny Gambini
 
Posts: 1
Joined: October 26th, 2016
 
 
 

Re: Q20

by jthor81 Mon Jan 02, 2017 2:00 pm

Could anyone explain why the top shelf can only have two places? The rule is it has to be less than the bottom shelf.

I found this puzzle really hard. :(
 
LauraM319
Thanks Received: 1
Vinny Gambini
Vinny Gambini
 
Posts: 1
Joined: November 11th, 2018
 
This post thanked 1 time.
 
 

Re: Q20

by LauraM319 Mon Dec 03, 2018 9:14 pm

I know this won't help the original poster, but in case it could help someone else:

the top shelf can only have 2 books because if the top shelf had 3 the rest could be distributed only 1 of 2 ways without violating the 2 per shelf rule.
1. Top: 3.
Middle: 3.
Bottom:2
This would violate the bottom has more than top shelf.
2. Top: 3
Middle: 2
Bottom: 3
Which also violates the bottom has more than top shelf rule.

Essentially, if the top has more than 2 books, there won't be enough books to follow the top<bottom rule and the 2 per shelf rule.