It seems that the text from the image does not contain an explicit equation to solve. Instead, it describes a scenario where you need to calculate the mass and volume of an energy storage system based on the power required and power generated by the batteries.

To assist you better, I would need additional information or specific data, such as the power required, power generated, energy density of the storage system, or any equations you are referencing. Could you provide that, or clarify if there is a specific equation you're referring to?

If you have such data or any further details, I can help you with the calculations.