A takes 19 days less
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suppose that B finished the work in X day
A takes = (x-19) days
A and B finished the work in = X + (x -19)
according to the question,
X + (X- 19) = 12
or, X + X -19 = 12
or, 2x = 12 + 19
or, x = 31 / 2 = 15. 5 days
B takes 15.5 days
A takes = (x-19) days
A and B finished the work in = X + (x -19)
according to the question,
X + (X- 19) = 12
or, X + X -19 = 12
or, 2x = 12 + 19
or, x = 31 / 2 = 15. 5 days
B takes 15.5 days
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