Arithmetic Aptitudes › Chain Rule › Question #5579
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Q8 men working for 9 hours a day complete a piece of work in 20 days in how many days can 7 men working for 10 hours a day complete the same piece of work

ID: #5579 Chain Rule 127 views
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#5579Q ID
DifficultDifficulty
Chain RuleTopic
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  • A 144/7 ✔ ✖
  • B 166/9 ✔ ✖
  • C 144/5 ✔ ✖
  • D 133/8 ✔ ✖
Correct Answer: Option A

Explanation

Solution:

Let the required number of days be x

Less men,more days(indirect proportional)

more hours per day ,less days(indirect proportional)

men 7:8::20:x

hours per day 10:9::20:x

(7×10x)=8×9×20

x=8×9×20/7×10

x=144/7

Hence required number of days =144/7

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