2. Sarita bought  $\frac{2}{5}$  metre of ribbon and Lalita $\frac{3}{4}$  metre of ribbon. What is the total length of the ribbon they bought?

$=\ \frac{2}{5}\ +\ \frac{3}{4}\ =\ \frac{2\times 4\ +\ 3\times 5}{20}\ =\ \frac{23}{20}$
Thus total length of ribbon is  $\frac{23}{20}\ m$.