Let's start with equations:
1.) "Hey, why don't you give me one of your models, and then I can have twice as many as you do."
x+1 = 2 (y-1) ==> (x+1) / 2 = y-1 ==> (x+1)/2 + 1 = y
2.)"No, why don't you give me one of YOUR models, and we can be even."
x-1 = x+1 ==> x-2 = y
3.) Put them in relation:
(x+1)/2 + 1 = x-2 ==> (x+1)/2 = x-3 ==> x+1 = 2x -6 ==> x = 7
4.) Finding out value for y by using equation (2)
7-1 = y+1 ==> y = 5
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