I am just very confused because if what it states is true and for every 2 hiking boots you subtract 3 running shoes then the max of 10 and 15 are not possible

I am just very confused because if what it states is true and for every 2 hiking boots you subtract 3 running shoes then the max of 10 and 15 are not possible class=
I am just very confused because if what it states is true and for every 2 hiking boots you subtract 3 running shoes then the max of 10 and 15 are not possible class=