If a brick weighs exactly 9 pounds rock plus half af another brick what does a brick and half weigh?

Let the weight of a brick be ( B ). According to the problem, ( B = 9 + \frac{1}{2}B ). Solving this equation, we get ( \frac{1}{2}B = 9 ), so ( B = 18 ) pounds. Therefore, a brick and a half weighs ( 1.5 \times 18 = 27 ) pounds.