\[\left( 3\frac{1}{4} - m \right)\ :1,2 = 0,24\]
\[\left( 3\frac{1}{4} - m \right)\ :\frac{6}{5} = \frac{6}{25}\]
\[3\frac{1}{4} - m = \frac{6}{25} \cdot \frac{5}{6}\]
\[3,25 - m = \frac{1}{5}\]
\[3,25 - m = 0,2\]
\[m = 3,25 - 0,2\]
\[m = 3,05.\]