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LET WHOLE WORK COMPLETED IN "X" DAYS.

A ONE DAY WORK = 1/10.

B ONE DAY WORK = 1/20.

(A+B) ONE DAY WORK = (1/10 + 1/20).

->(A+B) X-2 DAYS WORK = (X-2) * (1/10 + 1/20).

-> (X-2) * (1/10 + 1/20) + 2 * 1/20 = 1

-> X = 8 DAYS

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