# Advent calendar 2019

## 16 December

Arrange the digits 1-9 in a 3×3 square so that:
the median number in the first row is 6;
the median number in the second row is 3;
the mean of the numbers in the third row is 4;
the mean of the numbers in the second column is 7;
the range of the numbers in the third column is 2,
The 3-digit number in the first column is today's number.

median 6 | |||

median 3 | |||

mean 4 | |||

today's number | mean 7 | range 2 |