Correct Answer: Option B
(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
=> 11x = 1/7
=> x = 1/77.
Therefore, A's 1 day's work =(1/77)x 7 =1/11.
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