Solve for b
b=86
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0.25b=21+0.5
Add 0.5 to both sides.
0.25b=21.5
Add 21 and 0.5 to get 21.5.
b=\frac{21.5}{0.25}
Divide both sides by 0.25.
b=\frac{2150}{25}
Expand \frac{21.5}{0.25} by multiplying both numerator and the denominator by 100.
b=86
Divide 2150 by 25 to get 86.
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