What would the concentration of a 200 ml solution be, if 20 ml of a 0.5 M stock solution was diluted?

900

Explanation:

and after water is usually warmed by the sun the water temperature raises and then evaporates .

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.