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

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Senior Manager
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In a certain brick wall , each row of bricks above the [#permalink]

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New post 21 Nov 2003, 13:52
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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New post 21 Nov 2003, 14:13
1
1
17.

n+(n-1)+(n-2)+(n-3)+(n-4) = 75
5n-10=75
n=17
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New post 21 Nov 2003, 14:17
Right..... :thanks
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New post 21 Nov 2003, 14:42
2
Another easy way:

75/5=15. Middle row has 15

Two rows below has 17.
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New post 21 Nov 2003, 15:15
Oh yes!! that was very easy one..
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New post 02 Jun 2007, 01:00
stoolfi wrote:
Another easy way:

75/5=15. Middle row has 15

Two rows below has 17.


lol interesting shortcut!
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New post 12 Nov 2017, 05:16
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Re: In a certain brick wall , each row of bricks above the   [#permalink] 12 Nov 2017, 05:16
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