Question

Savita bought $\frac{2}{5}$ m of ribbon and Kavita $\frac{3}{4}$ m of the ribbon. What was of the total length of the ribbon they bought?

Answer 1

Length of the ribbon bought by Savita =$\frac{2}{5}\mathrm{m}$
Length of the ribbon bought by Kavita = $\frac{3}{4}\mathrm{m}$
Total length of the ribbon bought by them:

$$\begin{gathered} \frac{2}{5}+\frac{3}{4} \\ =\frac{2\times 4}{5\times 4}+\frac{3\times 5}{4\times 5}(\mathrm{Because}\mathrm{LCM}\mathrm{of}5\&4\mathrm{is}20) \\ =\frac{8}{20}+\frac{15}{20}=\frac{8+15}{20} \\ =\frac{23}{20}\mathrm{m} \end{gathered}$$