Question

Ritu bought $5\frac{1}{2}l$ of milk and her sister bought $4\frac{3}{4}l$ of milk. Who bought less milk and by what quantity?

Answer 1

$5\frac{1}{2}=\frac{5\times 2+1}{2}=\frac{11\times 2}{2\times 2}=\frac{22}{4}$

and

$4\frac{3}{4}=\frac{4\times 4+3}{4}=\frac{19}{4}$

$\therefore$ Ritu bought more milk $(\because \frac{22}{4}>\frac{19}{4})$

$\frac{22}{4}-\frac{19}{4}=\frac{3}{4}$

$\therefore$ Ritu bought $\frac{3}{4}l$ of more milk