<h3> The greatest number is

</h3>
<em><u>Solution:</u></em>
<em><u>Given that the numbers are:</u></em>

We have to find the number that is greatest
Convert the numbers to decimal




We can clearly see that, 199.7 is greatest number
Thus the greatest number is 
20•9=180
180•5=900
You have to brake down the problem to it simplest form
Answer: 
Step-by-step explanation:
In order to solve this exercise it is important to remember that a "Rate" is defined as a ratio that compares two different but related quantities.
Then, "Unit rate" tell us how many units of the first quantity corresponds to one unit of the second quantity. Therefore, the second quantity is equal to 1.
According to the information given in the exercise, you know that the number of hours of homework in 8 weeks is 240 hours.
Then, in order to determine the Unit rate (the number of hours per week), you need to divide 240 hours by 8 weeks.
Through the procedure explained above, you get the that the number of hours per week is the following:

(Notice that it is
)