Setting up the equation: \( (n - 2) \times 180 = 1440 \).
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- If the sum of the angles in a polygon is 1440 degrees, how many sides does the polygon have?
- The formula for the sum of the interior angles is \( (n - 2) \times 180 \) degrees, where \( n \) is the number of sides.
- Solving for \( n \): \( n - 2 = 1440 / 180 = 8 \), so \( n = 10 \).
- A mixture contains alcohol and water in the ratio 3:2. If there are 15 liters of alcohol, how much water is there?
- Let the amount of water be \( x \).
