What is the fraction expressed in lowest terms?

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

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?