Fractious Fractions

Express your answers in fractions using the following method: a/b (e.g. 1/2, 3/5, 25/37).

For example, for the question  $\frac{1}{2}+\frac{1}{4}=?$  the answer should be "3/4".

Answer the following question:  $\frac{1}{4}+\frac{1}{4}=?$  

 $\frac{2}{5}+\frac{1}{4}=?$  

 $\frac{1}{5}+\frac{3}{4}=?$  

 $\frac{3}{4}-\frac{1}{5}=?$  

 $\frac{3}{4}-\frac{3}{5}=?$  

 $\frac{1}{2}-\frac{2}{5}=?$  

 $\frac{3}{5}-\frac{1}{2}=?$  

 $\frac{1}{2}\div2=?$  

 $\frac{1}{2}\div3=?$  

 $\frac{2}{5}\div2=?$