# <span lang="EN-US

Let the number of days taken by B to finish the work be x.

Number of days taken by A to finish the work = 20.

Number of days taken by A and B together = 12.

According to the given condition,

(Transposing to RHS)

(LCM of 12 and 20 is 60)

x = 30

B alone can finish the work in 30 days.

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