0.5 ft
Step-by-step explanation:
The applicable volume formula is ...
V = length · width · height
Filling in the given numbers, we can solve for the width.
0.375 ft^3 = (1.5 ft) · width · (0.5 ft)
Dividing by the coefficient of width, we have ...
0.375 ft^3/(0.75 ft^2) = width = 0.5 ft
The width of Deena's tool box is 0.5 ft.