#### 48.5
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- Total from three exams: \( 85 + 90 + 88 = 263 \).
- Equation: \( 263 + 2x = 360 \).
- Solve: \( 2x = 97 \), so \( x = 48.5 \).
- A cylindrical tank with a radius of 3 meters and height of 5 meters is filled with water. If the water is drained at a rate of 2 cubic meters per minute, how long will it take to empty the tank?
- Volume of cylinder: \( \pi r^2 h = \pi \times 3^2 \times 5 = 45\pi \) cubic meters.
- Approximate volume: \( 45\pi \approx 141.37 \) cubic meters.
