Hello

This isn't really a urgent question, but i'd just like to ask something, that i have forgotten! I'v got a Maths Exam later today and i'm doing a bit of revision.

okay here it is:

600 mL to 1000 mL = 600 : 1000

= 3 : 5

=0.6

i'v forgotten how to to the numbers in bold. Like how do we simplify it? How do we narrow the result in red, to the bold numbers?

Thanks