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Discussion

Mathematics Preparation for SAT
(146)

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The volume of a cone increases by x cubic units after its radius is increased by 6 units. Increasing the height of the same cone by 9 units also increases the volume by x cubic units. If the original height is 3 units, then the original radius is

 
5 units
6 units
7 units
8 units
9 units

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Rahul S

Easier way : (V x)/V = (r 6^2)/(r)^2 which is also eq to h 6/h since V is directly proportional to r^2 and h