78.57142857%
the answer is above
you do 22/28
10
Just because the fish swam away doesn't mean they left the pond
Using the quadratic formula works but if you know there are 2 answers (highest power of problem tells you how many solutions) then
10x^2 = 5x
So either x = 0, giving 0=0. Or divide by 5x
2x = 1
x = 0.5