I would spend 20 hrs on assignments and studying and 25 hrs watching television.( 20:25).Therefore, the simplified ratio is

The simplified ratio of the time you spend on assignments and studying to the time you spend watching television is 4:5.

Here's how you get it:

1. Identify the total hours spent on assignments and studying, and the total hours spent watching television. In this case, it's 20 hours and 25 hours respectively.

2. Write this as a ratio. This gives you 20:25.

3. Simplify the ratio by finding the greatest common divisor (GCD) of both numbers. The GCD of 20 and 25 is 5.

4. Divide both numbers in the ratio by the GCD. This gives you 20 ÷ 5 : 25 ÷ 5 = 4:5.

So, the simplified ratio of the time you spend on assignments and studying to the time you spend watching television is 4:5.