Which ratio correctly compares 60 mm to 45 cm?

A.

40 : 3

B.

2 : 15

C.

2 : 150

D.

4 : 3

First we need to convert cm to mm

45 cm = 450 mm

Now our ratio looks like this

60/450

We can divide both by 30 and once we do that our ratio will look like this:

2/15

That means the answer is B