A hallway measuring 90 feet x 7 feet requires 1/2 ounce of cleaning solution per square foot. How much cleaning solution is required to clean the hallway.

The total area of the hallway is 90 feet * 7 feet = <<90*7=630>>630 square feet.

To clean the hallway, you would need 630 square feet * 1/2 ounce/square foot = <<630*1/2=315>>315 ounces of cleaning solution. Answer: \boxed{315}.

To find out how much cleaning solution is required to clean the hallway, you need to calculate the total area of the hallway and then multiply it by the amount of cleaning solution required per square foot.

1. Calculate the total area of the hallway:
Area = Length x Width
Area = 90 feet x 7 feet
Area = 630 square feet

2. Multiply the area by the amount of cleaning solution required per square foot:
Cleaning Solution = Area x Amount of solution per square foot
Cleaning Solution = 630 square feet x (1/2 ounce/square foot)
Cleaning Solution = (630/2) ounces
Cleaning Solution = 315 ounces

Therefore, 315 ounces of cleaning solution are required to clean the hallway.