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SAT模拟考试题:SAT数学练习题(14)

2016-08-11 16:53:56来源:网络

  SAT模拟考试SAT数学练习题(14):本文是sat数学模拟题。新东方在线SAT频道为大家整理了SAT模拟考试题,供考生们参考,以下是详细内容。

  Question #1: While competing in a marathon event, John is behind Mike by 100 yards. John runs (x - 2) yards while Mike runs (x + 10) yards. What is the new distance between them?

  (a) 112 yards

  (b) 108 yards

  (c) 102 yards

  (d) 110 yards

  (e) The answer is a function of x

  Solution: We can reference all distances to the point where John was at the time t1, when the distance between them is 100 yards.

  After John runs (x - 2) yards, he is (x - 2) yards from the reference.

  After Mike runs (x + 10) yards, he is 100 yards + (x + 10) yards = (x + 110) yards from the reference.

  The distance between them will be (x + 110) - (x - 2) = 112 yards.

  Question #2: What is the sum of 10% of x and 20% of 2x?

  (a) 10% of x

  (b) 20% of x

  (c) 30% of x

  (d) 50% of x

  (e) 100% of x

  Answer: 10% of x is .1x.

  20% of 2x = .2·2x = .4x.

  The sum of 10% of x and 20% of 2x is .1·x + .4·x = .5·x. In conclusion the sum is 50% of x.

  Question #3: What are the solutions of the equation 5x(x + 1)·5x = 1?

  (a) x1 = 0 and x2 = 2

  (b) x1 = 0 and x2 = 1

  (c) x1 = 2 and x2 = -2

  (d) x1 = 0 and x2 = -2

  (e) x1 = 1 and x2 = -2

  Answer: The left side of the equation: 5x·(x + 1)·5x = 5x2 + 2x.

  The right side of the equation: 1 = 50.

  5x2 + 2x = 50

  x2 + 2x = 0, x·(x + 2) = 0, and x1 = 0 and x2 = -2

  Question #4: Out of all of the houses characterized in the table below, what is the percentage of new ranches?

  HousesOldNewTotal

  Ranch23?30

  Colonial?40?

  Total23??

  (a) 10%

  (b) 12%

  (c) 15%

  (d) 25%

  (e) 8%

  Answer: The number of new ranches will be 30 - 23 = 7. We need to find the total number of houses.

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本文关键字: SAT模拟考试 SAT数学

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