GRE考试

【单选题】Evan has 4 times as many books asDavid and 5 times as many as Jason. If Jason has more than 40 books, what is the least number of books thatEvan could have
A、200
B、205
C、210
D、220
E、240
网考网参考答案：D
网考网解析：
Test the answer choices starting with the smallest value. If Evan had 200 books, Jason would have 40. But Jason has more than 40, so 200 is too small. Trying 205 and 210, we see that neither is a multiple of 4, so David wouldn’t have a whole number of books. Finally, 220 works. (So does 240, but we shouldn’t even test it since we want the least value.) **Since Jason has at least 41 books, Evan has at least 41×5 = 205. But Evan’s total must be a multiple of 4 and 5, hence of 20. The smallest multiple of 20 greater than 205 is 220. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>