The resistance of a wire varies directly as its length and inversely as the square of its diameter. A wire 50 m long and 0.01 m in diameter has a resistance of 25 ohms. Find the resistance of a wire made of the same material that is 20 m long and has diameter 0.02 m.

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.