Question

escribe el número que falta (write the missing number) once, doce, trece, catorce, ______________

Explanation:

In Spanish, the numbers are in sequential order. 'once' is 11, 'doce' is 12, 'trece' is 13, 'catorce' is 14, and the next number 15 is 'quince'.

Answer:

quince