I’m currently having a rough time in my math class. can anyone me out with some of my questions? it would be so appreciated

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {