Arithmetic Aptitudes › Chain Rule › Question #5621
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QIf 7 maids with 7 mops cleaned seven floors in 7 hours how long would it take 3 maids to mop three floors with three mops

ID: #5621 Chain Rule 371 views
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#5621Q ID
DifficultDifficulty
Chain RuleTopic
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  • A 7/3 ✔ ✖
  • B 3 ✔ ✖
  • C 49/3 ✔ ✖
  • D 7 ✔ ✖
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Solution

since each maid would work with one mop,so we shall consider 1 maid and q mop as 1 unit. Let the required time be x hours.

less maids and mops ,more time,less time (indirect proportion)

less floors,less time(direct proportion)

maida and mops 3:7::7:x

floors 7:3::7:x

3×7x=7×3×7

x=7×3×7/3×7

x=7

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