单项选择题

案例分析题

At the time during year X when the aggregate price of ABC and XYZ stock was the greatest, the price of ABC stock was approximately what percent of the price of XYZ stock （）

A.25
B.60
C.70
D.140
E.170

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单项选择题
When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students （）

A.6.5
B.6.75
C.7.0
D.7.25
E.7.5
单项选择题
If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of (a +b.2)（）

A.100
B.120
C.140
D.180
E.200
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