A dodecagon has 12 sides, so 3 of them would have 3 x 12 = 36 sides.
A quadrilateral has 4 sides, so 5 of those would have 5 x 4 = 20 sides.
A hexagon has 6 sides, so 2 of them have 6 x 2 = 12 sides.
A decagon has 10 sides, so 3 x 10 = 30 sides.
Total sides: 36 + 20 + 12 + 30 = 98 sides.
