Un barril de 80 litros contiene soo 12. Litros de su capacidad k porcentaje de su volumen está ocupado

there are many, many solutions to this problem.

here are 5 examples:

7555531, 7+5+5+5+5+3+1 = 31

7155553, 7+1+5+5+5+5+3 = 31

7735531, 7+7+3+5+5+3+1 = 31

7375531, 7+3+7+5+5+3+1 = 31

7335931, 7+3+3+5+9+3+1 = 31

the answer:

rolling a number cube twice

choosing a meal/drink combination

flipping a coin four times

i know because i just submitted my test and got everyone correct.

dwlovesminecraft is correct it is 2210.412.