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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
Given Kudos: 1053
GPA: 3.39
In a stack of boards at a lumber yard, the 20th board counting from th
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26 Jul 2022, 02:07
26 Jul 2022, 02:07
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Question Stats:
25% (02:41) correct
75% (00:53) wrong based on 4 sessions
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In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
A. 38
B. 36
C. 35
D. 34
E. 32
A. 38
B. 36
C. 35
D. 34
E. 32
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: In a stack of boards at a lumber yard, the 20th board counting from th
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26 Jul 2022, 08:24
26 Jul 2022, 08:24
2
GeminiHeat wrote:
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
A. 38
B. 36
C. 35
D. 34
E. 32
A. 38
B. 36
C. 35
D. 34
E. 32
Let's start from the bottom and work our way up:
We'll start with the 16th board counting from the bottom of the stack
Right BELOW that 16th board, we have a board that we'll call Larry.
So, Larry is the 15th board counting from the bottom of the stack.
So, starting from the bottom and working our way up to Larry, we have 15 boards so far.
Larry is the 20th board counting from the TOP of the stack
In other words, there are 19 boards ABOVE Larry.
So, including those 19 boards, we now have 34 boards in TOTAL.
Answer: D
Cheers,
Brent
gmatclubot
Re: In a stack of boards at a lumber yard, the 20th board counting from th [#permalink]
26 Jul 2022, 08:24
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