72 24 38 x 74 x 19 x 86 6. 62 85 x 37 49 x 91 x 48 7. mrs. doodle, the art teacher, bought 75 boxes of markers. there are 16 markers in a set. how many markers did she buy in all? 8. marvin practices baseball for 15 hours per week. how many hours does he practice in 35 weeks? 9. the briarville elementary school auditorium has 58 rows of seats with 72 seats per row. how many seats are in the auditorium in all? 10. each shelf in the pineville public library children's section holds 75 books. if there are 98 shelves in the children's section, how many books can the shelves hold altogether?