how much does she have so far in total??
2+ 3/5 is
2+\(\frac{3}{5}\)=\(2\frac{3}{5}\)
she needs 3, so she needs
3-\(2\frac{3}{5}\) more
let's change the 3 into a mixed number with a denominator of 5: \(2\frac{5}{5}\)
\(2\frac{5}{5}\)-\(2\frac{3}{5}\)=\(\frac{2}{5}\)
so \(\frac{2}{5}\) is the answer