Question

I need some help to know what to do

Answer 1

You already know the dimensions of the original field, which is 100 yards by 60 yards ---> multiply that to get the area of the original field which is 6,000 yards square.
To get the dimensions you need the area of pee-wee  field which can be found by 1/4x=6,000  x is the area of the peewee field.

then you figure out the dimentions from x.