For this case, we have to know if Nick removed[tex]\frac {3} {5}[/tex] from the snow on the grass yesterday, then it remains:
[tex]\frac {5} {5} - \frac {3} {5} = \frac {2} {5} \ of \ snow[/tex]
If from those[tex]\frac {2} {5}[/tex]then removed [tex]\frac {1} {4}[/tex] this morning, then it remains:
[tex]\frac {2} {5} - \frac {1} {4} = \frac {4 * 2-5 * 1} {20} = \frac {3} {20}[/tex]
Thus, it remains to remove [tex]\frac {3} {20}[/tex]of snow.
Answer:
[tex]\frac {3} {20}[/tex]
