Two angles are complementary angles. One angle measures 50 degrees. The other angle measures (4n-1) degrees. what is the value of n?

$${\mathtt{40}} = {\mathtt{4}}{n}{\mathtt{\,-\,}}{\mathtt{1}} \Rightarrow {\mathtt{n}} = {\frac{{\mathtt{41}}}{{\mathtt{4}}}} \Rightarrow {\mathtt{n}} = {\mathtt{10.25}}$$

the first angle is 50 degrees. For the two angles to be complementary, the other must be 40 degrees.  Therefore I used the formula above to come to the answer 10.25