OK Planks; I smell a trap. The commutative law of addition says the answer is 4,100, but there be a trap here. So I be taking another route. I think the first 1000 is a negative because you say take, like take away. The first and second 1000 cancel. We can add the 40 and 30, but you do not specifically say what to do with the 3rd 1000. I will assume add. Now we have 1070. You do not say to add the other numbers to each other but I assume we can; therefore, we have 1070+1030=2,100. I doubt if I'm right here because I think it is deeper than this, but give others time to come up with the right answer. I'll be watching.