Plz Plz Help!!!

Sarina shares a phone plan with her brother, Quentin. Each month, they are allowed to send a limit of 1000 text messages. Last month, they did not go over their 1000 text message limit. Sarina knows she sent 400 text messages.

How many text messages, on average, could Quentin have sent per day in the month? Last month, there were 30 days.