Given the following shapes: a trapezoid with bases 7 and 3 and height 3, a right_triangle with base 4 and height 6, a right_triangle with base 2 and height 4. What is the total area of all shapes? Please round the result to the nearest integer.
<think>Trapezoid with bases 7, 3 and height 3: Area = 0.5 x (7 + 3) x 3 = 15.0
Right triangle with base 4 and height 6: Area = 0.5 x 4 x 6 = 12.0
Right triangle with base 2 and height 4: Area = 0.5 x 2 x 4 = 4.0</think>

<answer>31</answer>