单项选择题

What is the largest prime factor of 255

A. 5
B. 15
C. 17
D. 51
E. 255
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单项选择题
Evan has 4 times as many books as David and 5 times as many as Jason. If Jason has more than 40 books, what is the least number of books that Evan could have
A. 200
B. 205
C. 210
D. 220
E. 240
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