book Maths Puzzle Numerical Ability

Use Eular's formula to find the number of edges in the polyhedrn made up of 5 faces: 2triangles and 3 rectangles.

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book Other Question

If M (5,2) is the midpoint of segment PQ and the coordinates of Q are (3,-3), find the coordinates of P. Graph the following linear equations and advise points:
3x-2y=12
and
y=2x+5

thanks!