- The product of A and B is the 2-digit number CD.
- The product of B and C is the 2-digit number DE.
- The three sums A+F, D+J, and E+K all have the same answer.
- The sums B+G and C+H are both even.
- C * E = J.

A | B | C | D | E |

F | G | H | J | K |

From Mensa Puzzle Calendar 2022 by Fraser Simpson, Workman Publishing, New York. Puzzle for January 6.