Choice Choice B is the correct answer.

1. Start with the equation: $2x + 15 = 25$
2. Subtract 15 from both sides: $2x = 25 - 15$
3. Simplify: $2x = 10$
4. Divide both sides by 2: $x = \frac{10}{2}$
5. Simplify: $x = 5$
6. Verify: $2(5) + 15 = 10 + 15 = 25$ ✓

Choice Choice D is incorrect because this results from adding 15 to 25: $40$, then $40/2 = 20$. Wrong inverse operation.

Choice Choice D is incorrect because this is the value of $2x$. You need to divide by 2.

Choice Choice A is incorrect because this results from multiplying 40 by 2? No, maybe $10 \times 8$? Unlikely. Probably just a random large number or calculation error.