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If 45 m of a uniform rod weight 171 kg, then what will be the weight of 12 m of the same rod?

49 kg
42.5 kg
55 kg
45.6 kg

Correct Answer: 45.6 kg

Explanation:

Let the required weight be w kg.
Less length, Less weight (Direct proportion)
45 : 12 :: 171 : w
∴ w = (12 x 171)/45 = 45.6 kg

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