2m³ of soil containing 35% sand was mixed into 6 m³ of soil containing 15% sand. what is the sand content of the mixture?

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.