I assume the question is to calculate how much work is left to complete.
we know that
the 100% of the work is equal to 1
so
To find how much work is left to complete
[tex]=1-(\frac{2}{5} + \frac{1}{3}) \\\\= 1-(\frac{6+5}{15}) \\\\=1- \frac{11}{15} \\\\=\frac{4}{15}[/tex]
therefore
the work completed is equal to [tex]\frac{11}{15}[/tex]
the pending work to be completed is [tex]\frac{4}{15}[/tex]
the total work is equal to [tex]\frac{15}{15}=1[/tex]
