A teacher gave her students a short quiz, but after grading the test, she lost her grade book and the answer key. Here are five students' exams:

Paul's test:

1. eggs
2. evaporation
3. Alligator
4. a potato
5. teeth

Todd's test:

1. milk
2. transportation
3. Alligator
4. a kangaroo
5. teeth

Jason's test:

1. eggs
2. transportation
3. Crocodile
4. a kangaroo
5. ears

Alicia's test:

1. eggs
2. evaporation
3. Alligator
4. a kangaroo
5. teeth

Bebe's test:

1. milk
2. transportation
3. Crocodile
4. a kangaroo
5. ears

She did remember, however, that someone got all five questions correct, someone got four right, someone got three correct, another person got two questions correct, and one person got only one answer right.

Who got all five questions correct?

Draw 5 'nodes', or boxes, 1 for each of the pupils.
Connect all of them to each other (with lines)
On each line write the number of answers the two 'nodes'/boxes/pupils share.
The one who got them all right is the only one who connects to the other four with a 4,3,2,1
This conveniently gives the information as to who got what on the test.
I know it's not particularly insightful - I just like the fact that when I drew it out in this fashion (expecting it to be harder) the question of who got what is instantly answered. In fact, this post took longer to type (I've got to stop doing that)

Posted by Lee on 2003-12-12 00:15:03