Helpp with this pleasee

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

Ahousekeeper mixed 5 gallons of blue paint with every 9 gallon of yellow paint in order to make a green paint which ratio of gallon of blue paint to gallon of yellow paint will make the same shade of green paint

27/9=18/x a. x=9 b. x=18 c. x=6 d. x=3