two copper wires A and B have the same mass the resistance of wire A is 0.5 ohm and the length of wire B is double that of wire A find the resistance of wire B
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ANSWER
If we view this question objectively we have troubles because too many details are ignored. We learn the wire is copper but are the two wires identical copper with identical preparation? Copper can be left hard after drawing or it can be heat treated (mainly annealed). This affects the resistivity and thus the wire's resistance. In addition, the purity of copper varies and this can be deliberate depending on requirements for different applications, and the tiny amounts of impurity influence the resistivity also.
Finally, nowhere are we assured either wire has a uniform diameter over its length. All these factors have consequences for the answer yet we blithely ASSUME the details. Maybe this makes sense for a class assignment but in the real world assuming is a bad habit which gets people into trouble now and then. Another thing which makes sense is for students to do their own homework; the teacher or textbook author invents these exercises and grades them to improve the skills and understanding of the student to whom the task is assigned. Having some third, kind person do the thinking largely negates the intended benefits.