Please help !! I don’t understand

Answer: The question is asking how many siblings Ricardo has according to the audio.
If the audio says cero(se-row) it means zero
if it says uno- one
dos- two
tres(thr-ess)- three
Listen to the audio for "ricardo tiene ____ hermanos"
or
"Ricardo no tiene hermanos"- meaning he has 0 brothers
or
"Ricardo tiene un hermano" -meaning he has 1 (uno)brother