# Arwen uses a dropper that produces drops that have a volume of 1/8 mL to fill a 30-mL test tube. How many drops does it take to fill the test tube?

Jun 21, 2018

color(maroon)("240 drops it requires to fill the test tube"

#### Explanation:

$\text{Total volume to be filled } = 30 m l$

$\text{Volume of one drop } = \left(\frac{1}{8}\right) m l$

$\text{No. of drops required to fill the test tube } = \frac{30}{\frac{1}{8}}$

$\implies \frac{30 \cdot 8}{1} = 240 \text{ } \mathrm{dr} o p s$