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Bunuel
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Bunuel
A rod that weighs 20 pounds is cut into two pieces so that one of the pieces weighs 16 pounds and is 36 feet long. If the weight of each piece is directly proportional to the square of its length, how many feet long is the other piece of rod?

(A) 9
(B) 12
(C) 18
(D) 24
(E) 27


­
Weight of a rod is 20 pounds.

It’s cut into two pieces of weights 16 and 4 pounds respectively.

The 16 pound weight rod is of length 36 feet.

Weight is proportional to (Length)^2

Weight = K . (length)^2

Where K is called the proportionality constant.

16 = K . (36)^2

k = (1/81)

We need to find the length of rod 2 , which weighs 4 pounds.

4 = K . (length)^2

4 = (1/81). ( Length)^2

Length ^2 = 81*4

Length = 9*2 = 18

Option C
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