A painter can paint a building in 4 days and his apprentice can do it in 6 days. How long will it take them to paint this building if they work together on it except for 1 day when the painter is ill and the apprentice works alone?
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work of one day of painter=1÷4
" " " '" " appropr. = 1÷6
they work together = 1÷4+1÷6= 10÷24= 5 upon 12
so painter was I'll so5÷12×1
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