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SAT模拟考试题:SAT数学练习题(18)

2016-08-11 16:59:05来源:网络

  The area of triangle CDF A2 = (1/2) · FC · DC = (1/2) · 5 · 10 = 25.

  The area of square ABCD A3 = AB · AD = 10 · 10 = 100.

  The area of parallelogram BFDE = A3 - A1 - A2 = 100 - 25 - 25 = 50

  A3 / A1 = 50 / 25 = 2

  Question 7: If 15% of x is 45, what is 20% of x?

  Answer: 60

  Explanation: 15% of x is (15/100)·x

  (15/100)·x = 45

  x = 45·(100/15) = 300

  The problem asks you to calculate 20% of x: 20%(300) = 60

  Question 8: Given the | x - 3 | = 5 equation, what is the average of its solutions?

  Answer: 3

  Explanation: Since |x - 3| = 5, the value of x - 3 is either 5 or -5.

  x - 3 = 5

  x = 8

  x - 3 = -5

  x = -2

  The two values of x that satisfy the equation are 8 and -2 and their average is 3.

  Question 9: In the x, y plane, what is the area of the quadrilateral delimited by the x axis, the y axis, the x = 5 line and the y = -5 line?

  Answer: 25

  Explanation:

  The geometric figure delimited by the 4 given lines is a square with the side equal to 5.

  The area of the square is 52 = 25.

  Question 10: If the average of x and y is 3, what is the average of x, y and 6?

  Answer: 3

  Explanation:

  (x + y)/2 = 3

  x + y = 6

  (x + y + 6)/3 = (6 + 6)/3 = 4

  更多SAT模拟考试题及备考资料敬请查看SAT真题栏目。


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本文关键字: SAT模拟考试 SAT数学

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