SAT数学备考经典模拟题训练30

>>SAT数学模拟题：SAT数学备考经典模拟题训练30

>>SAT考试辅导

· Question #9: If x + 4y = 6 and x - 2y = 3, which of the following statements is not true?

(a) y = 1/2

(b) x = 4

(c) y = 2

(d) xy = 2

(e) x + y = 9/2

· Question #10: Prizes totaling $60,000 were awarded unequally between 3 contestants. Which of the following choices could be the highest prize?

(a) $5,000

(b) $10,000

(c) $15,000

(d) $25,000

(e) $65,000

解析

o Answer: In order to find the values of x and y, we multiply the second equation by 2 and add the 2 equations:

x + 4y = 6

2x - 4y = 3

3x = 12 and x = 4, y = (6 - 3)/4 = 1/2.

y = 2 is the only equality that is false.

o Answer: The highest prize should be higher than one third of $60,000 and lower than $60,000. The only answer that satisfies these conditions is $25,000.

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