CalTheGreat

This similar question will help you:

[ ] These brackets means "Include".

() These parantheses means "Do not include".

However, this doesn't come in this case. Look at jfan's answer above.

This similar question will help you.
Look cloooosely at Chris's answer.

This similar question will help you:

You click the "Images" button, and enter the URL of the image.

Ratio: 25:16

--Divide each side by 8--

25/8 : 2

So, the oil spil covers 25/8 square meters after two hours.

Check this:

1/2 divided by 4

=1/2 times 1/4

1/8 kilograms

Check this: