Ideally, in order for us to have a 3,700 pound average, each of the four trucks would be 3,700 pounds. Added up, we would have a total of: 14,800 pounds (3,700×4)
Let's see how much pounds we already have:
3,250 + 3,890 + 3,640 = 10,780
Now we need to find how much pounds we are missing: 14,800 - 10,780 =
