To solve for \( b \) in the equation \( A = 12(a + b) \), we can start by isolating \( b \).
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Divide both sides by 12: \[ \frac{A}{12} = a + b \]
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Subtract \( a \) from both sides to isolate \( b \): \[ b = \frac{A}{12} - a \]
None of the provided responses match \( \frac{A}{12} - a \). However, it's possible that there was a mistake in the equation or the responses provided.
If you're looking for one of the given options, please double-check the equation or provide clarification.