Answer:
The third one. The square in the top left can only fold to the right or down.... which means there is guaranteed to be an open side remaining on the square.
To do this subtract 2 from each side of the equation to get y = -5, so the value of y in this is -5. Hope this helps!
Answer:

Step-by-step explanation:

For 20% out of 100% it would be 1/5 as you need 5 20s for 100