2019新SAT数学练习题及答案解析5

>>SAT考试模拟题：2019新SAT数学练习题及答案解析5

>>SAT考试经典课程推荐

Vera is planning to use exactly 112 feet(ft) of fencing as the border of a rectangular garden. If the width of the garden is 1/3 of the length of the garden, what is the width of the garden?

A.7ft

B.14ft

C.28ft

D.42ft

答案：B

解析：Choice B is correct. 宽是长的三分之一，长就是宽的3倍，则栅栏的宽=112/(2X4)=14ft

A study estimated that brown bears populate the Kenai Peninsula of Alaska at a density of 42 brown bears per 1000 km^2 of habitable area. According to this study, approximately how many brown bears populate an 8500 km^2 habitable area of this peninsula?

A.24

B.200

C.357

D.3035

答案：C

解析：Choice C is correct.

Hailey's laundry basket contains 7 shirts. These 7 shirts account for approximately 21% of Hailey's total number of shirts. How many shirts does Hailey have in total?

A.2 B.3 C.26 D.33

答案：D

解析：

题干翻译：衣服篓里有7件衬衫，他们大约占Hailey衬衫的21%。请问Hailey总共有多少衬衫?

Choice D is correct. Let T represent Hailey's total number of shirts. If 21% of Hailey's total number of shirts is 7, then the following equation can be written: 0.21·T=7

To solve for T, multiply both sides of the equation by 0.21. The value of T is 33.3. Because 21% represented an approximate portion of the total number of socks, the value found for T is not an exact amount. Therefore, the best answer for the Hailey's total number of shirts is 33.

The total number of shirts is 33.

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