A number hidden by spilt ink multiplied by 12 equals sixteen thousand, eight hundred and thirty-six. Sixteen thousand, eight hundred and thirty-six divided by a number hidden by spilt ink equals box.

12

Step-by-step explanation:

Assume the hidden number is x;

So, if x*12 = 16,836

Next, divide both sides by 12 to solve for x;

x = 16,836 / 12

x = 1,403

So the number hidden by spilt ink is 1,403.

Next, to answer the question, divide 16,836 by the hidden number, 1403;

16,836 / 1403 = 12

Therefore, it will be equal to 12 which is basically the reverse of the first equation.