Final answer:
To calculate the number of bricks for a 2-meter wide arch, we convert meters to centimeters and divide by the brick length. We find that 10 bricks are required. The final answer to the question is B. 10 bricks.
Step-by-step explanation:
The question is about calculating the number of bricks needed to construct an arch that is 2 meters wide given that each brick is 20 centimeters long. To find the answer, we need to convert the width of the arch into the same units as the length of the bricks, which means converting meters to centimeters. Since 1 meter is 100 centimeters, 2 meters will be equal to 200 centimeters.
We then divide the total width of the arch by the length of one brick to get the number of bricks that are required. This can be expressed as:
Width of the arch in centimeters: 2 meters × 100 cm/meter = 200 cm
Number of bricks required: 200 cm ÷ 20 cm/brick = 10 bricks
Therefore, 10 bricks are required to construct a 2-meter wide arch.