Stack of boards Qs : DS Archive
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# Stack of boards Qs

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Senior Manager
Joined: 20 Feb 2007
Posts: 256
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24 Mar 2007, 19:13
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Qs: 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

I do not have the OA.

I am not able to understand the question itself. Could anyone please explain the question?

Thanks!
VP
Joined: 06 Feb 2007
Posts: 1023
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24 Mar 2007, 20:01
Imagine a stack of bricks. So when you are counting from the top, the brick #20 is directly below the brick #16. However, the brick #16 is #16 only if you start counting from the bottom. So, the brick #20 is really #15 from the bottom. Makes sense?
So, to calculate the total number of bricks,

(15+20)-1 =34 or you can simply diagram the bricks and count them.

I get D.
Senior Manager
Joined: 20 Feb 2007
Posts: 256
Followers: 1

Kudos [?]: 47 [0], given: 0

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24 Mar 2007, 20:23
Yes!!! I got it now!! Thanks.

24 Mar 2007, 20:23
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