Solve for b
b=28
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480=\frac{20}{2}\left(20+b\right)
Multiply \frac{1}{2} and 20 to get \frac{20}{2}.
480=10\left(20+b\right)
Divide 20 by 2 to get 10.
480=200+10b
Use the distributive property to multiply 10 by 20+b.
200+10b=480
Swap sides so that all variable terms are on the left hand side.
10b=480-200
Subtract 200 from both sides.
10b=280
Subtract 200 from 480 to get 280.
b=\frac{280}{10}
Divide both sides by 10.
b=28
Divide 280 by 10 to get 28.
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