Your niece Honey girl is growing up fast. To find out her weight, you ask her to stand on a scale and see that it registers 80 lb. Remembering old times, Honey girl asks you to pick her up and carry her like you use to. You try but find that she's already grown too heavy for you. While attempting to lift her, you noticed that the scale she's standing on is now registering 20 lb.

a) How much force are you applying in lifting her?

b) Suppose that you are also standing on a scale at the same time that you're doing this, what will that scale register?

c) Finally, if both of these scales that you and Honey girl are standing on are located on top of a third (larger) scale, what will be its reading?