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?
- 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
- B. Entry B costs 1.2 million, less than Entry A.
- C. Both entries span 20 metres.
- 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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