单项选择题





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单项选择题
Bob and Jack share an apartment. If each month Bob pays a dollars and Jack pays b dollars, what percent of the total cost does Bob pay
单项选择题
For how many positive integers m ≤ 100 is (m -5)(m -45) positive
(A) 45
(B) 50
(C) 58
(D) 59
(E) 60
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