For each order, a mail-order bookseller charges a fixed processing fee and an additional shipping fee for each book in the order. Rajeev placed five different orders with this bookseller--an order for 1 book in January, an order for 2 books in February, an order for 3 books in March, an order for 4 books in April, and an order for 5 books in May. What was the total of Rajeev's processing and shipping fees for these five orders?
(1) Rajeev's processing and shipping fees were $1.00 more for his order in March than for his order in January.
(2) The total of Rajeev's shipping fees for the five orders was $7.50.
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.
看清是shipping 还是processing,条件一等价于条件二!
瞎眼
错因,审题出现错误,processing fee是一个order为单位fixed的,shipping fee才是根据book的数量而fixed的
a fixed processing fee and an additional shipping fee for each book in the order. P+nS
看清是shipping 还是processing!!!审题
看清是shipping fee 还是processing fee记processi fee=a, shipping fee=b,求a+b
(1)得出a+3b=a+b+1,不充分 (2)15b=7.5 不充分,(1)和(2)依旧不知道a多少,所以不充分,选E
审题,fixed processing fee
total fee = processing+shipping
charges a fixed processing fee
关键:读明白题目
X=P+S*n
两个条件都是给了S, 没有给P
看清楚题目问的是P和S总的费用
自始至终求不出固定的p是多少,这道题不能懒和想当然,得动动笔
看清!2 是shipping fee
charges a fixed processing fee and an additional shipping fee for each book in the order
processiong fee是固定的,额外的shipping fee是不确定的
条2:shipping fee…
第二个是shipping fee....果然读题太粗心
processing fee是fixed的!也就是固定的!!!
嗯···X=a+n*b
两个条件都是给了b, 没有给a。
是我英语太差了吗,为什么我觉得for each book in their order既可以修饰additional shipping fee也可以修饰fixed processing fee and additional shipping fee呢?
and并列,for不能跳跃修饰
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a fixed--不管多少本书,都是固定的;但是shipping fee是跟着书数量走的