2. 外语
  3. *For each year, the work time, in hours, required to pay for a food item is the average price of the food item divided by the av

*For each year, the work time, in hours, required to pay for a food item is the average price of the food item divided by the av

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问题
*For each year, the work time, in hours, required to pay for a food item is the average price of the food item divided by the average hourly wage for rank-and-file manufacturing workers. The work time in the graph is given in minutes.
In 1997, at the rates shown in the graph, the work time required to pay for which of the following food items was greatest?
选项 A、10 pounds of bread
B、5 gallons of milk
C、3 pounds of coffee
D、20 pounds of sugar
E、5 dozen eggs
答案B
解析 Reading from the graph, you can compute the approximate work times for the quantities listed in the choices.
Choice A: The approximate work time required to pay for 1 pound of bread was 4 minutes, so the approximate work time to pay for 10 pounds of bread was(10)(4), or 40 minutes.
Choice B: The approximate work time required to pay for - gallon of milk was 7 minutes, so the approximate work time to pay for 5 gallons of milk was(10)(7), or 70 minutes.
Choice C: The approximate work time required to pay for 1 pound of coffee was 17 minutes, so the approximate work time to pay for 3 pounds of coffee was(3)(17), or 51 minutes.
Choice D: The approximate work time required to pay for 5 pounds of sugar was 10 minutes, so the approximate work time to pay for 20 pounds of sugar was(4)(10), or 40 minutes.
Choice E: The approximate work time required to pay for 1 dozen eggs was 5 minutes, so the approximate work time to pay for 5 dozen eggs was(5)(5), or 25 minutes.
Of these times, the greatest is 70 minutes for 5 gallons of milk. The correct answer is Choice B.
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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