Information and IdeasVery hardChoosing the per-unit comparison
Information and Ideas practice question
Two ferries last month:
Ferry X: 60 crossings, 9,000 passengers
Ferry Y: 40 crossings, 7,200 passengers
A manager claims that Ferry Y carried more passengers per crossing than Ferry X. Which choice most effectively uses data from the table to support the claim?
- A. Ferry Y carried 180 passengers per crossing (7,200 ÷ 40), compared with 150 for Ferry X (9,000 ÷ 60).Correct
- B. Ferry X carried more passengers than Ferry Y.
- C. Ferry Y made fewer crossings than Ferry X.
- D. Ferry Y carried 7,200 passengers.
Answer: A. Ferry Y carried 180 passengers per crossing (7,200 ÷ 40), compared with 150 for Ferry X (9,000 ÷ 60).
Per crossing requires dividing passengers by crossings for both.
Why the other answers are wrong
- B. Ferry X carried more passengers than Ferry Y.
- Totals point the wrong way and ignore crossings.
- C. Ferry Y made fewer crossings than Ferry X.
- Crossings alone say nothing about passengers per crossing.
- D. Ferry Y carried 7,200 passengers.
- A total without a rate.
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