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Arithmetic Aptitudes Chain Rule
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Explanation:
Solution
Let the required length be x metres
More men ,more length built(direct proportional)
Less days,less length built (direct proportional)
men 20:35::56:x
Days 6:3::56:x
20×6x=35×5×56
x=35×3×56/120=49
Hence the required length is 49 m
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