AMC10 2017 A
AMC10 2017 A · Q3
AMC10 2017 A · Q3. It mainly tests Area & perimeter.
Tamara has three rows of two 6-feet by 2-feet flower beds in her garden. The beds are separated and also surrounded by 1-foot-wide walkways, as shown on the diagram. What is the total area of the walkways, in square feet?
Tamara 的花园里有三行两列 6 英尺 × 2 英尺的花坛。花坛之间以及周围都有 1 英尺宽的小路，如图所示。小路的总面积是多少平方英尺？
(A)
72
72
(B)
78
78
(C)
90
90
(D)
120
120
(E)
150
150
Answer
Correct choice: (B)
正确答案：（B）
Solution
The area of the garden is 15 · 10 = 150 square feet, and the combined area of the six flower beds is 6 · 6 · 2 = 72 square feet. Therefore the area of the walkways is 150 − 72 = 78 square feet.
花园的总面积是 15 · 10 = 150 平方英尺，六个花坛的总面积是 6 · 6 · 2 = 72 平方英尺。因此小路的面积是 150 − 72 = 78 平方英尺。
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