Chain Rule Q29

29. If 11.25 m of a uniform iron rod weighs 42.75 kg. what will be the weight of 6 m of the same rod?

[A] 22.8 kg

[C] 28 kg

[B] 25.6 kg

[D] 26.5 kg

Answer : A

Explanation :

Let the required weight be x kg. Then, Less lenght, Less weight (Direct Proportion)

11.25 : 6 :: 42.75 : x

11.25 x x = 6 x 42.75

x = (6 x 42.75) 11.25

x = 22.8