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SAT数学考试问答题练习题(6)

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  参考答案:

  参考答案:

  1.Correct Answer: 55

  Explanation:

  Time to be allotted = 20 x 45 seconds for the verbal and 80 x 30 seconds for the math questions. In seconds this is 900 + 2400 = 3300. Divide by 60 to get minutes = 55

  2.Correct Answer: 2.9

  Explanation:

  This is a proportionality problem.

  If 1 cm represents 100,000 cm

  Then 2.9 cm represents (100,000/1) x 2.9 = 290,000 cm

  Now convert to km (1km = 1000m = 1000x 100cm) by dividing by 100,000 = 2.9

  3.Correct Answer: 6

  Explanation:

  x + (x + 1) + (x + 2) = 12

  3x + 3 = 12; 3x = 9; x = 3

  The sides are 3-4-5

  The area = ½ x 4 x 3 = 6

  4.Correct Answer: 3553

  Explanation:

  The next will be 3553. (If you went for 4004, you did not make the palindrome as small as possible)

  5.Correct Answer: 10

  Explanation:

  If we take his current salary as 100 he donates 15.

  His new salary is 110 and he donates (15/100) x 110 = 16.5

  His contribution has gone up by 1.5

  As a percentage of his original contribution this is (1.5/15) x 100 = 10

  6.Correct Answer: 102

  Explanation:

  To find inclusive numbers take the differences and add 1

  204 - 103 = 101; 101 + 1 = 102

  7.Correct Answer: 30

  Explanation:

  Volume = length x breadth x height = 5 x 2 x 3 = 30

  8.Correct Answer: 9

  Explanation:

  x² - y² = (x + y)(x - y) = 9

  (x + y)(1) = 9; x + y = 9

  9.Correct Answer: 0.6

  Explanation:

  To find the average add up the score and divide by the number of subjects.

  76 + 74 + 92 + 81 + 80 = 403; 403/ 5 = 80.6 = M

  To find the median, put the scores in ascending order and find the middle term:

  74, 76, 80, 81, 92. The median = 80 = m

  M - m = 80.6 - 80 = 0.6 (Grid in .6)

  10.Correct Answer: 3

  Explanation:

  From the x-coordinates of points A and D we can work out the length of AD (2). Since BC will also be 2 we can find CD ½ (perimeter – AD + BC) =3

  Hence the coordinates of point C are 1,3

  Now we can find the value of w by substituting x = 1 and y = 3 in the equation y = wx² ; 3 = w.1; w = 3

重点单词   查看全部解释    
explanation [.eksplə'neiʃən]

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n. 解释,说明

 
constant ['kɔnstənt]

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adj. 经常的,不变的
n. 常数,恒量

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donate ['dəuneit]

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vt. 捐赠,转移(电子)
vi. 捐款

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score [skɔ:]

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n. 得分,刻痕,二十,乐谱
vt. 记分,刻

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perimeter [pə'rimitə]

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n. 周长,周界,边缘

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graph [grɑ:f]

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n. 图表,示意图
vt. (以图表)表示

 
contribution [.kɔntri'bju:ʃən]

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n. 贡献,捐款(赠)

 
minutes ['minits]

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n. 会议记录,(复数)分钟

 
verbal ['və:bəl]

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adj. 动词的,口头的,用言辞的,用文字的

 
triangle ['traiæŋgl]

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n. 三角(形)

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关键字: SAT 数学

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