Jojos bizzare adventure

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

Ineed to know the answer right now! !