exam Maths Puzzle Numerical Ability

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)

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exam Other Question

A weight of 200 grams is 40 cm from the center support of a stick . Where would a weight of 400 grams balance the stick? 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.