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Discussion

Quantitative Ability Preparation for MBA Entrance
(3)

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Three spherical marbles are placed in a hollow inverted cone, one above the other. Each marble is in contact with the adjacent marble(s). Also, each marble is in contact with the wall of the cone. The smallest marble has a radius of 8 cm. The largest marble has a radius of 18 cm.

The radius of the middle marble is

 
10 cm
12 cm
15 cm
16 cm
18 cm

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Vivek Jain

It would need concept of similar triangles.

Anil Kumar

We can also solve by lcm