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  3. At the rates shown in the graph, which of the following is closest to the number of hours of work time that was required to pay

At the rates shown in the graph, which of the following is closest to the number of hours of work time that was required to pay

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问题 At the rates shown in the graph, which of the following is closest to the number of hours of work time that was required to pay for 20 kilograms of sugar in 1919 ? (1 kilogram equals 2.2 pounds, rounded to the nearest 0.1 pound.)
选项 A、11
B、14
C、20
D、31
E、53
答案A
解析 If 1 kilogram equals 2.2 pounds, then 20 kilograms equals 44 pounds.
According to the graph, in 1919 the work time required to pay for 5 pounds of sugar was approximately 72 minutes, so the work time required to pay for 44 pounds of sugar was(72/5)(44), or 633.6 minutes, which is approximately 10.6 hours. Of the given choices, the one closest to this number is 11 hours. The correct answer is Choice A.
This explanation uses the following strategies.
Strategy 4: Translate from a Figure to an Arithmetic or Algebraic Representation
Strategy 5: Simplify an Arithmetic or Algebraic Representation
Strategy 9: Estimate
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