Answer :
Final answer:
The fraction of the wall which is brick can be found by dividing the thickness of the brick layer (9 inches) by the total thickness of the wall (22 inches). This results in the fraction 9/22.
Explanation:
This question is about understanding and calculating fractions. First, let's total up the thickness of the wall, which is 22 inches. This equals the sum of the thicknesses of the three different materials: concrete, brick, and limestone, equal to 8 inches, 9 inches, and 5 inches respectively. The fraction of the wall that is brick is thus the thickness of the brick layer (9 inches) divided by the total thickness (22 inches). When you divide 9 by 22, its decimal form equals approximately 0.409. We can convert this to a fraction by finding the closest fraction value to this decimal, which results to 9/22. Therefore, 9/22 of the wall is made of brick.
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