Carla and diane have started a pet sitting company. they have a 25 pound bag of food. there are 13 dogs. if each dog eats a
1/3
of a pound, how much dog food would be left?
a) 20 pounds
b) 20 2/3 pounds
c) 21 pounds
d) 21 2/3 pounds

Ok so 25 poundsof food 
13 dogs 
if each dog gets 1/3 
the in mixed version is 
13/3 and the answer is going to have 2/3 in it so we can get rid of 
A and C so we are left with 20 2/3 and 21 2/3 
well... 
this is already too long the answer is 20 2/3

What are the answer choices?