Answer: 30

12+15=27

15+11=26

11+18=29

So, 18+12=30

Answer: 4

1 circle + 1 triangle = 8
1 star – 1 square = 1 square

1 circle – 1 triangle = 4
We apply here 1 circle = 8 – triangle

8 – 1 triangle – 1 triangle = 4

1 triangle = (8-4) / 2

1 triangle = 2
1 square + 1 star = 12

We apply here 1 star = 2 x square

1 square + 2 Square = 12

3 square = 12

1 square = 12 / 3

1 square = 4

Applying the value of 1 triangle in 1 circle = 8 – triangle.

1 circle = 8 – 2

1 circle = 6

Applying the value of 1 square in 1 star = 2 x Square

1 star = 2 x 4

1 star = 8

Now, we know the value of each shape: Square = 4, Triangle = 2, Star = 8, and Circle = 6.

Let us solve the final equation.

5th Row: 1 triangle + 1 circle – 1 star + 1 square = ?

2 + 6 – 8 + 4 = ?

Apply BODMAS.

12 – 8= 4

Answer: 44

To solve this puzzle, we first need to assign values to each chess piece based on the given equations: Let's call the Rook (castle) "R", Let's call the Knight "N", and Let's call the Pawn "P".
Now, let's analyze the given equations:
P + P + P = 12
Therefore, P = 4 (12 divided by 3).
R + N - P = 4
Substitute P = 4.
R + N - 4 = 4
R + N = 8.
R + P = 8
Substitute P = 4.
R + 4 = 8
R = 4.
N + P = 15
Substitute P = 4.
N + 4 = 15
N = 11.
Now, we can solve the final equation:
P + N x R - P = ?
Substitute P = 4, N = 11, and R = 4.
4 + 11 x 4 - 4 = ?
4 + 44 - 4 = 44.
Therefore, the answer is 44.