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[ 39 + ( 3 - 1 ) * X ] / 3 = 21 → X = 12. s = X + X - 1 + X - 2 → 3X = s + 3. X + X + 1 + X + 2 = 3X + 3 = s + 6. 去程時間：12 min，回程只能跑 8 min. 故回程速度 10 mi
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請教別題?. 1.the daily rate for a hotel that sleeps 4 people is $39 for one person and X. dollars for each additional person.if 3 people take the room for
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把34拿掉放回38所有總和多了4. 所以平均多了4/12+N. ans: a. 先算出X到Y的距離: 60(時速)*3.5(花費時間) = 210 miles. 再算回程所需時間: 210/50 = 4.2(hr) = 4 hr and 12 min. ans: c. 假設 a job = X =
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1.the average (arithmetic mean) of a set of 12 numbers,which includes 34,is N. if 34 is removed the set and 38 is added to the set,what is the average
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