3/5x-21 is the answer(I think) if not it’s 21-3/5x

23 stones will be needed (you have to round up, since you can't have a fraction of a stone)
8.354 x 11.81= 98.66074
Simon used 98.66074 pounds of water while taking a shower.
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A square rotated about its center by 360º maps onto itself at 4 different angles of rotation. You can reflect a square onto itself across 4 different lines of reflection.