Question

Problem: The rectangular playing area of a professional football field is 100 yards long. The perimeter of the playing area is 920 feet. The formula for the perimeter of a rectangle is [P equals two times l plus two times w] .
How many feet wide is the playing area? Don't forget to convert the length from yards to feet. (There are 3 feet in 1 yard.)

Solution: There are two ways to solve this problem.
You can solve the formula for the unknown variable, then substitute. Or, you can substitute, then solve the resulting equation.

Assignment: Your assignment is to solve the problem both way

Answer 1

100 yards would be 300 ft, if you take out the lengths, 920- (300+ 300), then you have 320 left. divide by 2, 160 is your width.

Answer 2

Why would you do (300+300) ?

Answer 3

@ms_instrumental