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Expression of IdeasHardSynthesis: bridge entries over 120 years

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Entry A: a 20-metre steel span costing 2 million; steel lasts 120 years. - Entry B: a 20-metre timber span costing 1.2 million; timber needs replacing every 40 years.

The student wants to argue that Entry A is cheaper over 120 years. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Over 120 years Entry A costs 2 million once, while Entry B would need building three times at 1.2 million each, 3.6 million in all.Correct
  2. B. Entry B costs 1.2 million, less than Entry A.
  3. C. Both entries span 20 metres.
  4. D. Steel lasts 120 years.

Answer: A. Over 120 years Entry A costs 2 million once, while Entry B would need building three times at 1.2 million each, 3.6 million in all.

One steel span against three timber ones.

Why the other answers are wrong

B. Entry B costs 1.2 million, less than Entry A.
Favours B.
C. Both entries span 20 metres.
No cost.
D. Steel lasts 120 years.
Half the comparison.

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