Question

A four-litre juice bottle was opened to serve some guests. After serving, the bottle was half-empty. How much juice was left in the bottle?

Answer 1

Quantity of juice in the bottle = 4 litres

A half-empty bottle was left after serving.
Quantity of juice left after serving = half of 4 litres
$=\frac{1}{2}\times 4=\frac{4}{2}$

Divide the fraction by a common factor;
$\frac{4÷2}{2÷2}=\frac{2}{1}$

Thus, the quantity of juice left in the bottle is 2 litres.