标题: 问数学！！！请帮忙！！ [打印本页]
作者: sportman 时间: 2005-3-20 10:23 标题: 问数学！！！请帮忙！！
1. The average (arithmetic mean) of 4 positive integers is 50. If the average of 2 of these integers is 45, what is the greatest possible value that one of the other 2 integers can have ?
(A) 55
(B) 65
(C) 100
(D) 109
(E) 115
2。Every member of a certain club volunteers to con-tribute equally to the purchase of a $60 gift certificate. How many members does the club have?
(1) Each member's contribution is to be $4.
(2) If 5 club members fail to contribute, the share of each contributing member will increase by $2.
（2）单独为什么可以？
3。 Carmen currently works 30 hours per week at her part-time job. If her gross hourly wage were to increase by $1.50, how many fewer hours could she work per week and still earn the same gross weekly pay as before the increase ?
(1) Her gross weekly pay is currently $225.00.
(2) An increase of $1.50 would represent an increase of 20 percent of her current gross hourly wage
（2）单独为什么可以，那怎么求啊
作者: sammen 时间: 2005-3-20 20:55
1) D,4个数的合是200，其中2个数的合是90，那么剩下的2个数的合是110，又因为是正整数所以，最小是1，那么还有个数最大位109.
2)人数×每人的钱＝60加上（人数－5）×（每人的钱＋2）＝60可以解除答案。
3)1.5等于原来的工资的20％那么原来的工资是7.5每小时，可以求得原来的收入，有了原来的工资可求现在的工资，那么时间也可以求。
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