The fish weighs 20 pounds. Here's the formula from a geometric perspective.
One way to think of the problem is that:
fish weight = 10 + 1/2 (fish weight)
Assume x = fish weight, thus x = 10 + x/2
Solution:
Subtract 1/2x from both sides.
x - 1/2x = 1/2x + 10 - 1/2x
1/2x = 10
Multiply both sides by 2.
2 * (1/2x) = (2) * (10)
x = 20
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