Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem C. 838. (January 2006)

C. 838. Mihály Tímár (the hero of a famous Hungarian novel) is in a trouble. The red crescent that marked the sack containing the treasure has come off. He knows, however, that the heaviest of the four sacks hides the treasure. From three measurements, he has found out that the first sack together with the second one are lighter than the other two, the first and third together are equal in weight to the other two, and the first and fourth sacks together are heavier than the other two. Which sack hides the treasure?

(5 pont)

Deadline expired on February 15, 2006.


Sorry, the solution is available only in Hungarian. Google translation

Megoldás: A zsákok tömege legyen: a, b, c, d. Ekkor: a+b<c+d, a+c=b+d, a+d>b+c. Két-két összefüggés összegéből kapjuk:

2a+b+c<c+b+2d, vagyis a<d.

a+b+2c<a+b+2d, vagyis c<d.

a+2b+c<a+c+2d, vagyis b<d.

Így a negyedik zsákban van a kincs.


Statistics:

447 students sent a solution.
5 points:369 students.
4 points:7 students.
3 points:14 students.
2 points:21 students.
1 point:10 students.
0 point:25 students.
Unfair, not evaluated:1 solution.

Problems in Mathematics of KöMaL, January 2006