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# In a certain brick wall , each row of bricks above the

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Senior Manager
Joined: 30 Aug 2003
Posts: 314
Location: dallas , tx
In a certain brick wall , each row of bricks above the  [#permalink]

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21 Nov 2003, 12:52
1
In a certain brick wall , each row of bricks above the bottom row contains one less brinck thatn the row just below it. if there are 5 rows in a ll and a total of 75 bricks inthe wall ,how many bricks does the bottom row contain?
A.14
B. 15
C.16
D.17
E.18

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shubhangi

Director
Joined: 13 Nov 2003
Posts: 935
Location: Florida

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21 Nov 2003, 13:13
2
1
17.

n+(n-1)+(n-2)+(n-3)+(n-4) = 75
5n-10=75
n=17
Senior Manager
Joined: 30 Aug 2003
Posts: 314
Location: dallas , tx

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21 Nov 2003, 13:17
Right.....
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shubhangi

Senior Manager
Joined: 28 Oct 2003
Posts: 488
Location: 55405

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21 Nov 2003, 13:42
3
1
Another easy way:

75/5=15. Middle row has 15

Two rows below has 17.
Senior Manager
Joined: 30 Aug 2003
Posts: 314
Location: dallas , tx

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21 Nov 2003, 14:15
Oh yes!! that was very easy one..
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shubhangi

CEO
Joined: 21 Jan 2007
Posts: 2598
Location: New York City

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02 Jun 2007, 00:00
stoolfi wrote:
Another easy way:

75/5=15. Middle row has 15

Two rows below has 17.

lol interesting shortcut!
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Posts: 9413
Re: In a certain brick wall , each row of bricks above the  [#permalink]

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06 Dec 2018, 08:05
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Re: In a certain brick wall , each row of bricks above the &nbs [#permalink] 06 Dec 2018, 08:05
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