# Rockfall

Harassed during important experiments, three Earthlings

were taking three law-breaking Grundi to the authorities.

Suddenly they heard the thunderous roar of a

rockfall, and they knew they were facing sure death

unless they crossed to the other side of the canal. The

portable watercraft they carried with them would hold

only two passengers, regardless of weight. At no time

could there be more Grundi on either side of the water

than Earthlings or the Grundi would overpower the

Earthlings. How could they all cross the water safely

1. One Earthling took one Grundi across (leaving two

Earthlings and two Grundi on the west side).

2. One Earthling returned (leaving one Grundi east).

3. Two Grundi crossed (leaving three Earthlings west).

4. One Grundi returned (leaving two Grundi east).

5. Two Earthlings crossed (leaving one Grundi and one

Earthling on the west).

6. One Grundi and one Earthling returned (leaving one

Grundi and one Earthling on the east side).

7. Two Earthlings crossed (leaving two Grundi west).

8. One Grundi returned (leaving three Earthlings east).

9. Two Grundi crossed (leaving one Grundi west).

10. One Grundi came back (leaving three Earthlings and

one Grundi on the east side).

11. Two Grundi crossed (no one left in danger).

10. Fins and Feathers:

1. Uti finned and Uti feathered swung over.

2. Uti finned returned.

3. Grundi feathered and Grundi finned swung over.

4. Uti feathered returned.

5. Yomi feathered and Yomi finned swung over.

6. Grundi finned returned.

7. Uti feathered and Uti finned swung over.

8. Uti finned returned.

9. Uti finned and Grundi finned returned.

11. Flying Teams: Wora and Pyi.

1. From statement 6, we can assume that Xera and Rir

come from different groups since they would have

known one another if they were on the team from the

same group.

2. From statement 7, we learn that Xera is a Yomi.

3. Therefore neither Rir, who comes from another group,

nor Pyi, whom she will visit, comes from Yomi territory.

4. Since each team has one male on it, Vel, the only one

left, must be the male who is a Yomi

5. Since Xera is a Yomi, either Teta or Wora must be the

female on the Uti team.

6. But, from statements 5 and 8, we learn that Teta’s home

is the land of the Grundi.

7. Two Earthlings crossed (leaving two Grundi west).

8. One Grundi returned (leaving three Earthlings east).

9. Two Grundi crossed (leaving one Grundi west).

10. One Grundi came back (leaving three Earthlings and

one Grundi on the east side).

11. Two Grundi crossed (no one left in danger).

### Your Answer

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