7 workers can complete a piece of work in 12 days. How many additional workers will be required to complete double the work in 8 days?

Using the work equivalence formula of M1 times D1 over W1 equals M2 times D2 over W2, we substitute the values as 7 times 12 over 1 equals M2 times 8 over 2. Solving this gives M2 equals 21 workers. The question asks for additional workers, which is 21 minus 7, resulting in 14 workers, a value not listed in the options. The result is none of these.

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