2. 外语
  3. A car got 33 miles per gallon using gasoline that cost $2.95 per gallon. Approximately what was the cost, in dollars, of the gas

A car got 33 miles per gallon using gasoline that cost $2.95 per gallon. Approximately what was the cost, in dollars, of the gas

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问题 A car got 33 miles per gallon using gasoline that cost $2.95 per gallon. Approximately what was the cost, in dollars, of the gasoline used in driving the car 350 miles?
选项 A、$10
B、$20
C、$30
D、$40
E、$50
答案C
解析 Scanning the answer choices indicates that you can do at least some estimation and still answer confidently. The car used 350/33 gallons of gasoline, so the cost was (350/33)(2.95)dollars. You can estimate the product(350/33)(2.95)by estimating 350/33 a little low, 10, and estimating 2.95 a little high, 3, to get approximately(10)(3)= 30 dollars. You can also use the calculator to compute a more exact answer and then round the answer to the nearest 10 dollars, as suggested by the answer choices. The calculator yields the decimal 31.287..., which rounds to 30 dollars.
Thus the correct answer is Choice C, $30.
This explanation uses the following strategies.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
Strategy 9: Estimate
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