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# The cost of delivery for an order of desk chairs was $10.00  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: VP Joined: 22 Nov 2007 Posts: 1105 Followers: 7 Kudos [?]: 193 [0], given: 0 The cost of delivery for an order of desk chairs was$10.00 [#permalink]  11 Mar 2008, 22:24
The cost of delivery for an order of desk chairs was $10.00 for the first chair, and$1.00 for each additional chair in the order. If an office manager placed an
order for n desk chairs, is n > 24 ?

(1) The delivery cost for the order totalled more than $30.00. (2) The average (arithmetic mean) delivery cost of the n chairs was$1.36.
Director
Joined: 10 Sep 2007
Posts: 949
Followers: 7

Kudos [?]: 206 [0], given: 0

Re: gprep inequalities [#permalink]  12 Mar 2008, 07:08

Statement 1;
Tells us total delivery cost is $30. So for first chair = 10 and remaining 20 chairs = 20 => Total chairs 1 + 20 = 21 So question can be answered by this statement alone. Statement 2; Tells us average delivery cost of all chairs = 1.36 10 + (n-1)*1/n = 1.36 => n = 25 So question can be answered with this alone as well. Do not worry if both options are giving different results, point to note here is that both can provide us the answer. VP Joined: 22 Nov 2007 Posts: 1105 Followers: 7 Kudos [?]: 193 [0], given: 0 Re: gprep inequalities [#permalink] 14 Mar 2008, 02:34 abhijit_sen wrote: Answer is D. Statement 1; Tells us total delivery cost is$30.
So for first chair = 10 and remaining 20 chairs = 20 => Total chairs 1 + 20 = 21
So question can be answered by this statement alone.

Statement 2;
Tells us average delivery cost of all chairs = 1.36
10 + (n-1)*1/n = 1.36 => n = 25
So question can be answered with this alone as well.

Do not worry if both options are giving different results, point to note here is that both can provide us the answer.

OA is B.
1 says only that 10+(n-1)>30 and that n>21. so we don't know whether n>24.
Re: gprep inequalities   [#permalink] 14 Mar 2008, 02:34
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