Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem K. 441. (December 2014)

K. 441. If the sum of the digits of a two-digit number is added to the product of the digits, the result is the number itself. Find all such two-digit numbers.

(6 pont)

Deadline expired on January 12, 2015.


Statistics:

113 students sent a solution.
6 points:94 students.
5 points:5 students.
4 points:3 students.
3 points:5 students.
2 points:3 students.
1 point:1 student.
Unfair, not evaluated:2 solutions.

Problems in Mathematics of KöMaL, December 2014