Well, we know something else. We know, and this was actually much easier to figure out, we know that the sum of this whole table right over here, A plus 110 plus 95 plus 70 plus 75 plus B is equal to 500, or if we, let me write that down. So we know that A plus 110 plus 95 plus 70 plus 75 plus B needs to be equal to 500, needs to be equal to 500, or we could subtract 110 plus 95 plus 70 plus 75 from both sides and get, if you subtract it from the left-hand side, you're just left with A plus B, A plus B, and on the right-hand side, if we start with 500, so 500 minus 110, minus 95, minus 70, minus 75 gets us to 150. So A plus B must be equal to 150, is equal to 150. And now we have a system of two equations and two unknowns, and so we know how to solve those. We could do it by substitution, or we could subtract the second equation from the first. So let's do that.