Three angles are complementary one of the angles measurement is 10 the other two are equal what is the unknown angles??? Plz help

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 properties allow transformation to be used as a problem solving tool

Can someone me and do the problem plz so i can understand it more better