Ben was helping the school custodian set up chairs in the gym for an assembly. They needed to seat 180 students and put the same number of chairs in each row. The custodian suggested having 18 rows of chairs. After hearing the custodian's plan and doing some quick mental math, Ben suggested a different arrangement for the same number of seats. He explained that, by putting 5 more chairs in each row, they could have fewer rows, and students in the back row would be able to see better. How many rows will Ben's plan have? How many chairs were in each row of Ben's plan?