Question

john has 2 apples his friend eats 2 hiw many are left

Answer 1

The ratio of volume of distilled water to the volume of antibiotic remain constant in order to main the strength of medicine.

Let x be the volume of water added to 30 centimeter cube of antibiotic.

So the relation is expressed as,

$\begin{gathered} \frac{x}{30cm^3}=\frac{5cm^3}{12cm^3} \\ x=\frac{5cm^3\cdot30cm^3}{12cm^3} \\ =\frac{150cm^6}{12cm^3} \\ =12.5cm^3 \end{gathered}$

So 12.5 centimeter cube is added to the 30 centimeter cube of antibiotic.

Answer: 12.5 centimeter cube.