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 totaled more than $30.00.
(2) The average (arithmetic mean) delivery cost per chair of the n chairs was $1.36.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
more than.... more than.... more than......
问法理解错了
粗心
第一个选项的more than看掉了 抱头痛哭
可是is语句不是只要能判断是或不是都可以算作sufficient吗???
第一个选项是more than 30, 不是=30,所以算出的range是21或者以上,无法判断是否超过24
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(1) n=21
(2) n=25
stupid mistake.
要把(1)算出来