Final answer:
Brian laid bricks at a rate of 225 bricks per hour, calculated by dividing the total number of bricks (900) by the total time (4 hours).
Step-by-step explanation:
Brian laid 900 bricks in 4 hours. To calculate the rate at which Brian laid bricks, we divide the total number of bricks laid by the total time it took to lay them. The formula to find the rate is:
Rate = Total number of bricks ÷ Total time
Using Brian's numbers:
Rate = 900 bricks ÷ 4 hours = 225 bricks per hour
Therefore, Brian laid bricks at a rate of 225 bricks per hour.