1. The problem states that out of 25 buttons, 12 are black and the rest are white. 2. To find the number of white buttons, we use the formula: $$\text{White buttons} = \text{Total buttons} - \text{Black buttons}$$ 3. Substitute the given values: $$\text{White buttons} = 25 - 12$$ 4. Simplify the expression: $$\text{White buttons} = 13$$ 5. Therefore, there are 13 white buttons.