Assuming that x = width
the length would be = x+20
x (x+20) = 500
X^2 +20x - 500 = 0
Based on the equation above, you can find the x which will became the width and then added that width with 20 and you find the length
hope this helps
I believe the second one : drawing a number from a hat, not replacing it, and then drawing a second number
HERE THE EQUATION IS
=> d = 5x+ 5y
=> d = 5(x+y)
Divinding both side by 5
=> d/ 5 = x+y
=> d/5-x = y
=> y = (d- 5x)/5
So the THIRD option is right for your question.
The answers are 24 and -2