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Answer with Explanation:

(A's 1 day's work) : (B's 1 day's work) = 7/4 : 1 = 7 : 4.

Let A's and B's 1 day's work be 7x and 4x respectively.

Then, 7x + 4x = 1/7  =>     11x = 1/7 =>     x = 1/77.

Therefore A's 1 day's work = ( 1/77 x 7)= 1/11 .
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