Mark:
TRACK MEET
Well, I had typed up the whole explanation (factors of 40, etc.), then hit a wrong key and lost it all.
(I know that feeling, there should be a ?'put it back like it was meant to be' button.)
Since I don't feel like retyping it, I'll just give the final results:
Event Riddles Trivia History
----------------------------------
SP . . . 2nd/2 . 1st/5 . 3rd/1
HJ . .. . 1st/5 . 3rd/1 . 2nd/2
#3 . . . 1st/5 . 3rd/1 . 2nd/2
#4 . . . 1st/5 . 3rd/1 . 2nd/2
#5 . . . 1st/5 . 3rd/1 . 2nd/2
----------------------------------
. . . . . . . . 22 . . . . 9 . . . . . 9
Riddles won the high jump event in the track meet involving the three forums.
Five points were awarded for each first place Three different positive integers provide points for first, second and third place in each event. The integer for first place must be at least 3.
We know there are at least two events in the track meet, and that Trivia (which won the shot-put) had a final score of 9, so the integer for first place cannot be more than 8. Can it be 8? No, because then only two events could take place and there is no way that Riddles could build up a total of 22 points. It cannot be 7 because this permits no more than three events, and three are still not sufficient to enable Riddles to reach a score of 22.
Slightly more involved arguments eliminate 6, 4 and 3 as the integer for first place. Only 5 remains as a possibility. p If 5 is the value for first place, there must be at least five events in the meet. (Fewer events are not sufficient to give Riddles a total of 22, and more than five would raise Trivia's total to more than 9.)
Trivia scored 5 for the shot-put, so its four other scores must be 1. Riddles can now reach 22 in only two ways: 4, 5, 5, 5, 3 or 2, 5, 5, 5, 5. The first is eliminated because it gives History a score of 17, and we know that this score is 9. The remaining possibility gives History a correct final tally, so we have the unique reconstruction of the scoring shown by Mark.
Riddles won all events except the shot-put, consequently it must have won the high jump.
This problem can be solved without any calculation whatever. The necessary clue is in the last paragraph. The solution to the integer equations must indicate without ambiguity which forum won the high jump. This can only be done if one forum won all the events, not counting the shot-put; otherwise the problem could not be solved with the information given, even after calculating the scoring and number of events.
Since the forum that won the shot-put was not the over-all winner, it is obvious that the over-all winner won the remaining events. Hence without calculation it can be said that Riddles won the high jump.
Way to go Riddles!!!
To celebrate the extraordinary dexterity of the Riddles victory
You're given a hundred dollars and told to spend it all purchasing exactly a hundred animals at the pet store.
Dogs cost $15. Cats cost a dollar, and mice are 25 cents each.
You have to purchase at least one of each animal.
The question is, how many of each animal do you have to purchase to equal one hundred animals purchased at exactly one hundred dollars