单项选择题

Jordan has taken 5 math tests so far this semester. If he gets a 70 on his next test, it will lower the average (arithmetic mean) of his test scores by 4 points. What is his average now

(A) 74
(B) 85
(C) 86
(D) 90
(E) 94
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单项选择题
A bag contains 3 red, 4 white, and 5 blue marbles. Jason begins removing marbles from the bag at random, one at a time. What is the least number of marbles he must remove to be sure that he has at least one of each color
(A) 3
(B) 6
(C) 8
(D) 10
(E) 12
单项选择题
A family’s unmet need (which must be covered by a financial aid package) is defined to be the total cost of attending an institution of higher education minus the expected family contribution. What is the unmet need of a family whose income is $55,000 and who has a child attending a 4-year public university
A．$700
B．$3300
C．$6800
D．$7500
E． $12,500
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