SAT数学备考经典模拟题训练42

>>SAT数学模拟题：SAT数学备考经典模拟题训练42

>>SAT考试辅导

练习题内容

3. ♠n denotes the number obtained when n is rounded to the nearest tenth. For example ♠4.31 = 4.3

♠0.089 - ♠1.135 =

A. 1.05

B. 1.04

C. -1.05

D. -1.0

E. -0.1

4. Half the people on a bus get off at each stop after the first, and no one gets on after the first stop. If only one person gets off at stop number 7, how many people got on at the first stop?

A. 128

B. 64

C. 32

D. 16

E. 8

练习题解析

3.Correct Answer: D

Explanation:

0.089 to the nearest tenth = 0.1

1.135 to the nearest tenth = 1.1

0.1 - 1.1 = -1

4.Correct Answer: B

Explanation:

Work backwards. If one person got off at stop 7, as the bus approached the stop there must have been two people on board. As it approached the previous stop (no. 6) there were four on board. Approaching stop 5, there were 8. Approaching stop 4, there were 16 on board. Approaching stop 3, there were 32. Approaching stop 2, there were 64. As stop 2 was the first stop at which people got off there must have been a total of 64 people who boarded at the first stop. (We are assuming that no people could have been on the bus before the first official stop.)

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