Book Maths Puzzle Numerical Ability

a car engine is half filled and holds 15 litres petrol.what fraction of engine it contains 18 litres of petrol.

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The shopkeeper charged 12 rupees for a bunch of chocolate. but bargained to shopkeeper and got two extra ones, and that made them cost one rupee for dozen less than first asking price .
How many chocolates I received in 12 rupees ?
Rajesh is practising with his gun and keeps shooting at exact intervals of 34 minutes.Arun comes in a bus to meet Rajesh and he hears the 2nd shot 33 min after he hears the 1st. What is the speed of the bus(in kmph) if sound travels at 330 m/s ?