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In a stack of boards at a lumber yard, the 20th board counting from th
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RossItaly
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Re: In a stack of boards at a lumber yard, the 20th board counting from th [#permalink] New post  31 Dec 2020, 04:54
Perhaps with practice I will understand this question some day.

My approach 20+16=36. Should be "B"

However, we should deduct 2 boards. Why?

Also, why we should immagine two different columns of boards but not only 1? I mean from the pictures above, there are two separate columns, however we were not told on the stem about that.

Thank you for your patience in explaining.
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Re: In a stack of boards at a lumber yard, the 20th board counting from th [#permalink] New post  31 Dec 2020, 05:07
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RossItaly wrote:
Perhaps with practice I will understand this question some day.

My approach 20+16=36. Should be "B"

However, we should deduct 2 boards. Why?

Also, why we should immagine two different columns of boards but not only 1? I mean from the pictures above, there are two separate columns, however we were not told on the stem about that.

Thank you for your patience in explaining.


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

The question stem says two counting pattern one from the top and the other from the bottom. WHEN COUNTING FROM THE BOTTOM THE 20TH BOARD IS BELLOW 16. So, when counting from the bottom the 16th board and the 15th board overlapped. So we are deducting 2 from the total board.

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RossItaly
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In a stack of boards at a lumber yard, the 20th board counting from th [#permalink] New post  31 Dec 2020, 05:36
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Thank you, I got why we had to deduct 2 boards of the stock. The counting goes from the top and bottom. Two boards are considered twice, thus we have to deduct them. Only the drawing on the paper helps to understand the problem.
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