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VP
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The cost of delivery for an order of desk chairs was $10.00 [#permalink] ### Show Tags 11 Mar 2008, 22:24 This topic is locked. If you want to discuss this question please re-post it in the respective forum. 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: 947 Followers: 8 Kudos [?]: 287 [0], given: 0 Re: gprep inequalities [#permalink] ### Show Tags 12 Mar 2008, 07:08 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.
VP
Joined: 22 Nov 2007
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14 Mar 2008, 02:34
abhijit_sen wrote:

Statement 1;