Answer:
x = 4
Explanation:
given each brick is the sum of the two bricks below it , then
second row bricks are
3x + 11 and 11 + x
the top row brick = 38 , so
3x + 11 + 11 + x = 38
4x + 22 = 38 ( subtract 22 from both sides )
4x = 16 ( divide both sides by 4 )
x = 4