Solution:Though car consumption means http://www.racq.com.au/cars-and-driving/cars/owning-and-maintaining-a-car/fuel-saving-tips/measuring-fuel-consumption that desribe here’s broadly
The following formula is used to calculate fuel consumption in litres / 100kms, the most commonly used measure of fuel consumption.
Example a car uses 65 litres to travel 500km
(65 X 100) / 500 = 13
(Litres used X 100) / km travelled = Litres per 100km.
but in the problem it is saying that medium of the car consumption with 3 digit after the decimal point so we have just divided the integer x and float y and got the answer. 🙂