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Lake Trips (Posted on 2013-01-17) Difficulty: 3 of 5
Agnes, Becky, Cindy and Delia crossed a lake in a canoe that held only two persons.
  1. The canoe held two persons on each of three forward trips across the lake and one person on each of two return trips.
  2. Agnes was unable to paddle when someone else was in the canoe with her.
  3. Becky was unable to paddle when anyone else but Cindy was in the canoe with her.
  4. Each person paddled continuously for at least one trip.
Who paddled twice?

No Solution Yet Submitted by K Sengupta    
Rating: 2.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Solution | Comment 1 of 2
For brevity, represent the girls by their first initial:
1) B&C go over, B paddles (allowed since C is with her)
2) C goes back alone (C has no restrictions)
3) A&D go over, D Paddles (D has no restrictions)
4) A goes back alone (allowed - A is alone)
5) A&C go over, and C must paddle due to the restriction on A

Therefore C, or Cindy paddles twice.

  Posted by Kenny M on 2013-01-17 20:46:21
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