Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. Ifthe length of the longest piece of rope is 14 centimeters more than 4 times the length of the shortest piece of rope, what is the maximum possible length, in centimeters, of the longest piece of rope?
(A) 82
(B) 118
(C) 120
(D) 134
(E) 152
答案：D
答案：A
Last year, for every 100 million vehicles that traveled on a certain highway, 96 vehicles were involved in accidents. If 3 billion vehicles traveled on the highway last year, how many of those vehicles were involved in accidents? (1 billion =1,000,000,000)
(A) 288
(B) 320
(C) 2,880
(D) 3,200
(E) 28,800
答案：C
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