Economics help, basic intro to Econ.

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4

Anew landowner is interested in constructing a fence around the perimeter of her property. her property is 1,080√30 feet wide and 500√20 feet long. what is the perimeter of the property? (recall that the perimeter is the sum of each side of a shape or boundary). a 1,580√40 feet b. 5,320√5 feet c. 3,160√20 feet d. 10,640√5 feet

What is the missing value in the proportion 4/5 = x/30