Hi there!
mistake= step 2..
If you can see, the equation is the opposite so this means that to find the answer, your gonna have to add first.. instead of subtracting..
<em><u>1.Add the terms:</u></em>
<em><u /></em>
<em><u /></em>
<em><u>2.Simplifly the terms:</u></em>
<em><u /></em>
<em><u /></em>

<em><u>3.Subtract the terms:</u></em>
<em><u /></em>
<em><u /></em>
Therefore, the mistake was step 2...
A+10=b5, I am not to sure but try it I am sorry if it is incorrect.
The range is 2.5 to 8.5. Range is the lowest number to the highest number.
5 because 20:6 is the car to motorcycle.
6:15 is the motorcycle to van.
20÷15=5
~JZ
A, B, and C are correct. My bad.