Olga used 100 ounces of flour to make 225 muffins. How many ounces of flour will be used to make 300 muffins?

125 ounces of flower

The question asks for the amount of flour he would use to make 300 muffins given that he uses the same amount of flour to make his muffins.

The first time he uses 100 ounce of flour to make 225 muffins

We want to find how much flour he uses for each muffin in order to find how much flour he needs to make 300 muffins.

100ounces/225muffins=4/9 ounce per muffin

4/9 ounce per muffin x 300 muffins=400/3 ounces of flour