Personally I think the 3rd forth and the last one is but I’m not to sure
The maximum is 4 days
200:42= 4,76
You have to use Pythagorean theorem
12^2+20^2 = x^2
sqrt(144*400) = x^2
sqrt(544) = x
X = 4 sqrt(34)
44,580 x 47 %
44,580 x .47 = 20,952.6
So, the water decreased 20,952.6 ft
If you want the water level after the drought just subtract.
44,580 - 20,952.6 = 23,627.4 ft
Hope this helps. :)