What is the answer too 6+3=x-8?

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

Tom drove 206 miles in 3.9 hours. estimate his average speed.