How many cones of radius 4 m, height 2 m can be formed from a cylinder of 12 m radius, 10 m height:  Choose the correct option:
A) 135 B) 125 C) 145 D) 115 E) 155

Rationale: ( cylinder volume ) / ( cone volume ) ( π r ( power 2 ) h ) / ( 1 / 3 π r ( power 2 ) h ) = ( π × 12 × 12 × 10 ) / ( 1 / 3 π × 4 × 4 × 2 ) = 135 answer is a .
Answer: A