exam Maths Puzzle Numerical Ability

A furniture company has established the price-demand function p(x)=65-2.3x and the cost function C(x)=250+15x, where x is in hundreds of chairs, and C is in thousands of dollars.

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exam Other Question

I have a question about midpoints and segment congruence. Here it is:
It says given the coordinate of one endpoint line AB and its midpoint M, find the coordinates of the other end point. A(0,9), M(2,5) The sum of two numbers is 111, and their difference is 63.
What are the two numbers?

*what is the formula?