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In a stack of boards at a lumber yard, the 20th board [#permalink]

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14 Nov 2006, 13:59

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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?

Im confused with the phrase "immediately below 16 from the bottom". When you count something and you say immediately below something doesnt that it mean next number in the counting. In this example it will be 17th. How do you guys say it is 15th from the bottom?

Any clarification will help on Tuesday attempt.

Thanks

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

There are some number of boards stacked.

20th board from the top is immediately below the 16th board from the bottom:

1 2 3 . . .16 2015 14 13 . . . 3 2 1

As you can see 20th board from the top is immediately below the 16th board from the bottom. The total number of boards 20(red)+14(blue)=34.

20th board from top is 15th (immediately below the 16th board) from bottom. Therefore, there are 14 more boards below the 20th board (from top).
Total number of boards = 34

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?

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

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02 Sep 2012, 08:17

Guys,

Im confused with the phrase "immediately below 16 from the bottom". When you count something and you say immediately below something doesnt that it mean next number in the counting. In this example it will be 17th. How do you guys say it is 15th from the bottom?

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

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29 Jan 2014, 09:27

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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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

Please support your answer with explanation.

We need the 20th board, when we start counting from the top. This board is immediately below the 16th board from the bottom. i.e. This is the 15th board from the bottom Hence we have 14 more boards below this.

Total number of boards = 14(No. of boards below the one in consideration) + 20(No. of boards above the one in consideration) = 34 Option D
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Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

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07 Jan 2017, 07:41

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

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06 May 2017, 12:42

I'm not entirely sure what this is testing. Is this a pure logic question? Can we expect to see more questions like this on the GMAT and do we have any additional related practice problems?

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