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
