Is 5:20 and 15:60 equivalent

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

We just started the introduction into circles and i have no idea how to do this.

Simplify using positive exponents only.