Adriana and Farid are both selling cookie dough for a fundraiser. Although Adriana has already sold 9 tubs, Farid hasn't sold any yet. If Adriana starts selling 7 tubs per day and Farid begins selling 8 tubs per day, they will eventually sell the same amount of cookie dough. How many tubs will each sell? How many days will that take?
Adriana and Farid will each sell ____tubs of cookie dough in ____days.