7 maids with 7 mops chaned 7 floors in 7 hours, time taken by3 maids to mop 3 floors with 3 mops?

this is an aptitude based question
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1 Answer

if 7 du 7 rooms in 7 ours, then 1 du 1 room in 7 ours

& that meen 3 du 3 rooms in 7 ours
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