In the diagram, all rows, columns and diagonals have the same sum. What is the value of $x$ ?
(A) 12
(B) 13
(C) 16
(D) 17
(E) 18

![](https://cdn.mathpix.com/cropped/2024_04_20_46ead6524a8d61e21c51g-080.jpg?height=217&width=211&top_left_y=1962&top_left_x=1488)
The sum of the numbers in the second column is $19+15+11=45$, so the sum of the numbers in any row column or diagonal is 45 . The sum of the two numbers already in the first row is 33 , so the third number in the first row (in the upper right corner) must be 12. Finally, the diagonal from bottom left to top right has $x, 15$ and 12 , so $x+15+12=45$ or $x=18$.

Answer: (E)