Pehaps because perimeter is not a word they normally come across.
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If you are talking about a rectangle, you can't find the area from just the perimeter. With a perimeter of say 80 units, the sides could be 10 and 30, with an area of 300 square units. But the sides could also be 5 and 35, with an area of 175 square units. There are lots of other possibilities. If you are talking about a square, that's different. Each side is a quarter of the perimeter, so the area is a quarter of the perimeter multiplied by a quarter of the perimeter.
Since the perimeter of the base is 20 and the height of the shape is 2, we can find the area of the sides by multiplying these together. 20 x 2 = 40 The area of the top and base are given as 50 square units each, so we add 2 lots of 50. 40 + 50 + 50 = 140 square units.
You get 6 equal area's of 50 square metres.
50
This is an awkward one, it involves dividing 300 by 6...