Mathematical and Physical Journal
for High Schools
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Problem C. 1318. (November 2015)

C. 1318. The number 518 has an interesting property. Consider the six three-digit numbers obtained with the different permutations of the digits of 518. The mean of these numbers is equal to 518. Find all three-digit numbers of different digits with this property.

(5 pont)

Deadline expired on December 10, 2015.


209 students sent a solution.
5 points:81 students.
4 points:47 students.
3 points:16 students.
2 points:26 students.
1 point:25 students.
0 point:13 students.
Unfair, not evaluated:1 solution.

Problems in Mathematics of KöMaL, November 2015