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he has done 1/4 work yester day and today does 2/3
So,
work remaining = total work - (work done today + work done yesterday)
(work done today + work done yesterday) = 1/4+2/3
= 3(1/4) + 4(2/3) [after LCM]
= 3/12 + 8/12
= 11/12
Now,
work remaining = 1 - 11/12
= 12-11/12
= 1/12
hope u understand
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