If the water level of a pool dropped by 20% over night, by how much percent does it need to increase to get to the same level? Answer is 25%
I set it up like this x-x80/100=y
y+y(z/100)=x i dont know how to quantify a percentage differently and thats where i think I'm wrong..scratch that i know I'm wrong cause i have 2 equations with 3 variables. Can i get a hint? Don't want the full set up, i want to get it, cause ill feel stupid if i dont.