Explanation:

Let's break down the equation step by step to find the correct answer:

- The equation is: \(550\%\) of ? ÷ 110 + \(250\%\) of 300 ÷ 75 = 25

- Calculate \(250\%\) of 300:

$$250\% \times 300 = 2.5 \times 300 = 750$$

- Divide 750 by 75:

$$\frac{750}{75} = 10$$

- Rearrange the equation:

$$\frac{550\% \text{ of ?}}{110} = 25 - 10 = 15$$

- Multiply both sides by 110:

$$550\% \text{ of ?} = 15 \times 110 = 1650$$

- Calculate \(?\):

$$5.5 \times ? = 1650$$

$$? = \frac{1650}{5.5} = 300$$

Correct answer is Option:3, 300

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