Answer:
[tex]\large \boxed{\text{67 scoops}}[/tex]
Step-by-step explanation:
1. Calculate the volume of the container
V = lwh = 3 ft × 1.5 ft × 1 ft  = 4.5 ft³
2. Convert cubic feet to gallons
There are 7.48 gal in 1 ft³
[tex]V = Â \text{4.5 ft}^{3} \times\dfrac{\text{7.48 gal}}{\text{1 ft}^{3}} = \text{33.7 gal}[/tex]
3. Calculate the scoops of drink mix
You need 2 scoops for each gallon.
[tex]\text{Scoops} = Â \text{33.7 gal} \times\dfrac{\text{2 scoops}}{\text{1 gal}} = \text{67 scoops}\\\\\text{You need $\large \boxed{\textbf{67 scoops}}$ of drink mix}[/tex]