Is 12/15 equivalent to 36/45

Neveah and clint are baking muffins for the bake sale. they need to bake 30 muffins for their display case. clint has baked 4 so far, and neveah has baked 7. how many muffins (m) do they have left to bake? show your work!

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose