Q: If 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 [MAT 2005]

Answer: D

Explanation:

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

Chain Rule

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