Time to eradicate the bugs!
Due to the poisonous nature of the bugs, a cannon is used to eradicate them. You are the cannon operator. There are five different cannonballs of radii 2cm, 3cm, 4cm, 5cm and 6cm. Each cannonball can cover an area of a circle that is 30 times its radius. Which radius of cannonball should you use to kill the maximum number of bugs, with minimum damage to surroundings, if you are firing after the bugs have been spreading for half a minute? Assume the cannonball always lands in the centre of the circle covered by the bugs.
Note: This question follows on from my previous question in the my set 'Tree'.
p.s. how do you put a link to a set/question on a word?
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