You made 3/20 of the 400 cards, which is 60 cards.
1. (5 + 4) x 2 + 6 - (2 x 2) - 1
2. 9 x 2 + 6 - 4 - 1
3. 18 + 6 - 4 - 1
4. 24 - 4 - 1
5. 20 - 1
6. 19
Check the picture below.
the volume of a rectangular prism is just the product of its 3 dimensions, so the volume of those two there is 4*9*6 and 3*6*5.
so the volume for the composite figure is just the sum of those two products.
6x+19.98=200
200-19.98=6x
X= 200-19.98/6
= solve for it.
The HA Theorem is a special case of the AAS postulate.