450:150

The ratio 450:150 can be simplified by dividing both sides by their greatest common divisor (GCD).

First, let's find the GCD of 450 and 150. The GCD is 150.

Now, we can simplify the ratio:

450 ÷ 150 = 3
150 ÷ 150 = 1

So, the simplified ratio is 3:1.