Question

A well with 30 metre inner diameter is dug 6 m deep. Earth taken out of it, has been evenly spread all around it to a width of 15 m to form an embankment. The height (in metres) of the embankment is :

A 5 m Correct Answer Incorrect Answer
B 4.5 m Correct Answer Incorrect Answer
C 1.8 m Correct Answer Incorrect Answer
D 2 m Correct Answer Incorrect Answer
E 4.9 m Correct Answer Incorrect Answer

Solution

Let the required height = h metres Therefore, [(60/2)2- (30/2)2]x h = (30/2)2x 6 h = 2 m

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