单项选择题

In 1950 Roberto was four times as old as Juan. In 1955 Roberto was three times as old as Juan. How old was Roberto when Juan was born

(A) 5
(B)10
(C) 20
(D) 30
(E) 40
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单项选择题
Let P and Q be points which are two inches apart, and let A be the area, in square inches, of a circle which passes through P and Q. Which of the following is the set of all possible values for A
(A) 0＜A
(B) 0＜A ≤π
(C) A=π
(D) A＞π
(E) A ≥π
单项选择题
In the figure above, what is the value of h
(A) 2
(B) 2.2
(C) 2.4
(D) 2.6
(E) 2.8
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