3gallons of paint are used tonpaint 16 wooden signs. how much paint did each sign use. between what two whole numbers does the answer lie?

Let us first relate to the situation: 3 gallons of paint are used to paint 16 wooden signs.
Thus,we need to  solve how much paint did each sign use
 Second question: between what two whole numbers does the answer lie?
=> 3 gallons of paints : 16 wooden sign.
=> 3 gallons / 16 wooden signs = 0.19 gallons of paint per wooden sign.
Therefore, every 1 wooden sign we will be suing 0.19 gallons of paint. 
Between which 2 whole number the answer lie, well, i can;t really tell since I 'm not sure what you mean.

Where's the rest of the