Question

A scientist needs 0.25 kilograms of a substance to conduct some experiments. The substance can only be purchased in milligrams. Which of the following amounts of the substance should the scientist order? 250,000 milligram 0.00025 milligrams 0.00000025 milligrams 250 milligrams

Answer 1

There are thing we must already know:

`\begin{gathered} 1\text{kilogram}=1,000\text{gram} \\ 1\text{gram}=1,000milligram \end{gathered}`

From this, we must know that:

`1\text{kilogram}=1,000,000\text{milligram}`

The scientis needs 0.25kilograms. From this we calculate:

`0.25\text{kilograms}=0.25*1000000milligrams=250,000milligrams`