Fill in the missing numbers in the magic square so that the sum of each row, column, and diagonal is the same.

We can use the diagonal from the top-right to the bottom-left, as it has three known numbers: 7, 6, and 5.
Magic Constant (S) = $7 + 6 + 5 = 18$.
So, the sum of every row, column, and diagonal must be 18.

Let's denote the cells as:

Given: $a=9, c=7, e=6, g=5, h=10$. We need to find $b, d, f, i$.

• Find $i$ (bottom-right cell): Using the bottom row: $g + h + i = S$ $5 + 10 + i = 18$ $15 + i = 18$ $i = 18 - 15$ $i = 3$

• Find $b$ (top-middle cell): Using the top row: $a + b + c = S$ $9 + b + 7 = 18$ $16 + b = 18$ $b = 18 - 16$ $b = 2$

• Find $d$ (middle-left cell): Using the left column: $a + d + g = S$ $9 + d + 5 = 18$ $14 + d = 18$ $d = 18 - 14$ $d = 4$

• Find $f$ (middle-right cell): Using the middle row: $d + e + f = S$ $4 + 6 + f = 18$ $10 + f = 18$ $f = 18 - 10$ $f = 8$

The completed magic square is: