Elliot buys a 5 pound package of ground beef for 12.50 varna buys a package of ground beef for 7.50 at the same unit price. what is the weight of the package

For this case what we can do is the following rule of three.
 5 pound ---> 12.50 $
 x > 7.50 $
 Clearing x we have:
 x = (7.50 / 12.50) * (5)
 x = 3 pounds
  
 the weight of the package is:
 x = 3 pounds