In the diagram, 3 of the $1 \times 1$ squares that make up the $4 \times 5$ grid are shaded. How many additional $1 \times 1$ squares need to be shaded so that one-half of all of the $1 \times 1$ squares are shaded?
(A) 5
(B) 9
(C) 7
(D) 6
(E) 8

![](https://cdn.mathpix.com/cropped/2024_04_20_e85ef69091c57cb633f3g-032.jpg?height=228&width=279&top_left_y=672&top_left_x=1346)
The $4 \times 5$ grid contains 20 squares that are $1 \times 1$.

For half of these to be shaded, 10 must be shaded.

Since 3 are already shaded, then $10-3=7$ more need to be shaded.

ANswer: (C)