the answer is 12 :)
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A decagon has ten sides and a triangle has three, so 5 decagons and 4 triangles have (5*10)+(4*3) = 62 sides altogether.
4 triangles
A pentagon has 3 triangles and 5 sides
There are 4 triangles that make up a pyramid. 4 on the sides and on the bottom a square or rectangle.
There are 12 sides in a dodecagon, 4 in a quadrilateral, and 3 in a triangle. So in 4 dodecagons, 4 quadrilaterals, and 4 triangles there are 4*12 + 4*4 + 4*3 = 48 + 16 + 12 = 76 sides altogether.