I am assuming the questions is:

"American football fields measure 100 yards long between the end zones and are 52 1\3 yards wide. Is the length of the diagonal across this field more or less than 120 yards?"

To solve this problem we will use the Pythagorean Theorem:

a^2+b^2=c^2

In our case:

a = 100 yd

b = 52 1/3 yd = 52.33 yd

c = is the diagonal

We plug the values into a^2+b^2=c^2 and get:

100^2+52.33^2 = c^2

........

click here to see the equation solved for c

........

c = 112.86 yd (We need to ignore the negative solution because the length of the diagonal can only be positive.)

112.86 < 120

The length of the diagonal across the filed is less than 120 yards.