两题目没太懂意思...
90. (D)
On Jane's credit card account, the average daily balance for a 30-day billing cycle is the average (arithmetic mean) of the daily balances at the end of each of the 30 days. At the beginning of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Jane's account for the billing cycle?
(1) Jane's payment was credited on the 21st day of the billing cycle.
(2) The average daily balance through the 25th day of the billing cycle was $540.
71. (B) -------题中问的total salary不是没变么,只是人数变了啊.---total of the combined salary什么意思?
On July 1 of last year, the total number of employees at Company E was decreased by 10 percent. Without any change in the salaries of the remaining employees, the average (arithmetic mean) employee salary was 10 percent more after the decrease in number of employees than before the decrease. The total of the combined salaries of all of the employees at Company E after July 1 last year was what percent of that before July 1 last year?
(A) 90%
(B) 99%
(C) 100%
(D) 101%
(E) 110%
71. (B) -------题中问的total salary不是没变么,只是人数变了啊.---total of the combined salary什么意思?
On July 1 of last year, the total number of employees at Company E was decreased by 10 percent. Without any change in the salaries of the remaining employees, the average (arithmetic mean) employee salary was 10 percent more after the decrease in number of employees than before the decrease. The total of the combined salaries of all of the employees at Company E after July 1 last year was what percent of that before July 1 last year?
(A) 90%
(B) 99%
(C) 100%
(D) 101%
(E) 110%
第一题:
题干定义了ADB,然后说了一个例子.这个人刚开始的ADB为600,有一次付了300,就是剩下300.根据定义,其实只要知道是哪天付出去的就可以起初这个月的ADB.
(1)可以
(2)告诉你前25天的ADB(说明在25天前已经付出钱了,如果要算的话,也可以,列个方程,求出是第15天付出的),然后后5天的ADB就是300(因为没有变化了).so,可以!
答案D!
71. (B) -------
On July 1 of last year, the total number of employees at Company E was decreased by 10 percent. Without any change in the salaries of the remaining employees, the average (arithmetic mean) employee salary was 10 percent more after the decrease in number of employees than before the decrease. The total of the combined salaries of all of the employees at Company E after July 1 last year was what percent of that before July 1 last year?
我怎么觉得题目自相矛盾???虽然算是算出来了.....
题中红色字体不是说了"total salary没变, 只是人均变成了10% more" . 既然总的salary没变,怎么还问那个问题?
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