2. 外语
  3. Rectangle R has length 30 and width 10, and square S has length 5. The perimeter of S is what fraction of the perimeter of R ?

Rectangle R has length 30 and width 10, and square S has length 5. The perimeter of S is what fraction of the perimeter of R ?

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问题 Rectangle R has length 30 and width 10, and square S has length 5. The perimeter of S is what fraction of the perimeter of R ?
选项
答案20/80
解析 The perimeter of R is 30 + 10 + 30 + 10 = 80, and the perimeter of S is(4)(5)= 20. Therefore, the perimeter of S is 20/80 of the perimeter of R. To enter the answer 20/80, you should enter the numerator 20 in the top box and the denominator 80 in the bottom box. Because the fraction does not need to be reduced to lowest terms, any fraction that is equivalent to 20/80 is also considered correct, as long as it fits in the boxes. For example, both of the fractions 2/8 and 1/4 are considered correct.
Thus the correct answer is 20/80(or any equivalent fraction).
This explanation uses the following strategy.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
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