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新SAT数学练习题附答案解析(30)

2018-05-23 19:39:00来源:新东方在线论坛

  新SAT数学练习题解析

  9.Correct Answer: C

  Explanation:

  The median is the middle number when ranked (or the average of the middle tow numbers if there are an even number of items in the list). If we list out in order we will write 17 zeros, 13 ones, 21 twos etc. Since there are 60 drivers, the median will come between the value for the 30th and 31st drivers. We can already see that starting at the zero end, the 30thdriver will be in the ones section of the list, but the 31st driver will be in the twos section. Hence the median is 1.5.

  10.Correct Answer: A

  Explanation:

  We have to rearrange the equation to make R the subject.

  Start by cross multiplying by (r + R); V (r + R) = 12R

  Multiply out the bracket Vr + VR = 12R

  Subtract VR from both sides (to collect 'R' terms on the same side): Vr = 12R - VR

  Next put 'R' outside a bracket: Vr = R(12-V)

  Finally divide both sides by (12-V): the answer is that R is equal to Vr/(12-V)

  

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