Answer: 1 dozen cupcakes can be made in 12 cups of flour.
Step-by-step explanation:
Given : The amount of flour a baker has = 

The number of cupcakes he made by using all flour = 
i.e.
cupcakes made in
cups of flour
By unitary method ,
1 cupcake made in
cups of flour.
i.e. 1 cupcake made in
cups of flour.
Then , 12 cupcakes can be made in
cups of flour.
= 27 cups of flour.
Since<em> 1 dozen = 12</em>
Then , 1 dozen cupcakes can be made in 12 cups of flour.