25. Someone had cut off part of the stick of butter, so Carol couldn't read it all, but the part that she could read was marked "6 tablespoons - 3/4 stick". How many tablespoons of butter are there in a whole stick?

 

This can also be done as an A = RB type of problem. The rate here is the number of tablespoons per stick. Since we do not know the number of tablespoons per stick, we use the formula R = A/B, where, since the units are tablespoons per stick, we put the tablespoons on top and the sticks on the bottom.