Respuesta :

one dog is 50lb 
one dog is 55lb
one dog is 61lb
one dog is 67lb
one dog is 78lb  
there are five dogs that are 50lb and over 
5 | 0 = 50 lbs
5 | 5 = 55 lbs

That's 2 dogs so far

6 | 1 =  61 lbs
6 | 7 = 67 lbs
7 | 8 = 78 lbs

There is a total of 5 dogs that weigh at least 50 lbs.