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Arithmetic Aptitudes Chain Rule
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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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