1. **State the problem:** We need to find a system of inequalities representing the number of ushers ($x$) and tech crew members ($y$) based on hours worked and uniforms available.
2. **Given information:**
- Ushers work 3-hour shifts: total usher hours = $3x$
- Tech crew work 6-hour shifts: total tech crew hours = $6y$
- Total volunteer hours must be less than 60: $$3x + 6y < 60$$
- Theatre has 12 uniforms total
- Each usher needs 1 uniform: $x$ uniforms
- Each tech crew member needs 2 uniforms: $2y$ uniforms
- Total uniforms used must be less than or equal to 12: $$x + 2y \leq 12$$
3. **Analyze the options:**
- The hours inequality must be strict less than 60, so $3x + 6y < 60$
- The uniform inequality must be $x + 2y \leq 12$ because the theatre only has 12 uniforms available, so the total uniforms used cannot exceed 12.
4. **Conclusion:** The correct system is:
$$\begin{cases} 3x + 6y < 60 \\ x + 2y \leq 12 \end{cases}$$
This matches option B.
**Final answer:** Option B
Volunteer Inequalities E74Bbc
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