Question 115312
The starting weight of the alloy = 2 kg and one half of it is tin.

That is 1 kg of the starting weight is tin.

Now, x amount of tin is added with the alloy and copper is remained constant.

So, the total amount of tin after the new addition is 1 + x.

The total weight of the alloy = 2 + x.

So, C(x) = Total amount of tin / total amount of alloy = (1 + x)/(2 +x).