21+13+16 = 50, if the sum of the numbers in each row and column is 50,

Then s = 50-13-19 =18, and verify the first column:12+s+20 =18+20 = 50.

That is to say, in this table, the sum of the numbers in each row and column is 50.

p = 50-2 1- 12 = 17，C = 50- 17- 19 = 14。

P= 17，S= 18，C = 14。