A recipe for 12 bran muffins calls for 1 cup of flour. the number of muffins that can be made varies directly with the amount of flour used. There are 1 and 1/4 cups of flour available. How many muffins can be made?

Fifteen muffins can be made.

12 muffins = 1 cup

x = 1 1/4 cups

x = 5/4 cups

cross multiply:

12*5 / 4 = x * 1

3 * 5 = x

x = 15

Answer = 15 Muffins

Other way:

1 1/4 cups = how many muffins

you already know 1 cup = 12 muffins

remaining 1/4 cups = how many muffins?

1/4 of 12 = 3

So 12 + 3 = 15 muffins