What is the Concentration of a Substance in gdm^-3 Given Volumes V1 and V2?

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The discussion revolves around calculating the concentration of a substance in gdm^-3 using given volumes V1 and V2. The user expresses confusion about the question, particularly regarding the term V2 - 2(V1). Clarification is provided that V2 - 2V1 is a calculation based on the known volumes. The user seeks assistance in understanding the problem and how to approach the solution. Overall, the focus is on resolving the confusion surrounding the calculation of concentration in the context of a chemistry homework question.
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Please see the attached,this is the last question of my chemistry homework but I can't figure it out.And sorry for that I can't type any attempt at a solution because I don't understand what it is asking for.And something appears in the question like V2-2(V1) confused me.Hope someone can help or explain the question to me,thx.
Note that unit of concentration is gdm^-3
 

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V1 and V2 are volumes of the titrant, as described in the upper part of text. V2-2V1 is just a number calculated using known volumes V1 and V2.
 
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