A car consumes a gallon of petrol for every 30km drive. The driver of the car set out on a journey of 420km with 10 gallons of petrol in the fuel tank. (I) How many more gallons of petrol we be needed to complete the journey. (ii) Find the cost of petrol used for the journey of 420km if a gallon of petrol cost Ghc 5.50​

Respuesta :

The additional amount of gallons of petrol that would be needed to complete the journey is; 4 gallons

How to calculate proportion?

A) 1 gallon is required for 30 km drive. Thus;

420 km drive will require; 420/30 = 14 gallons

Since he had 10 gallons already, then additional gallons required = 4 gallons

B) We are told that  a gallon of petrol cost Ghc 5.50​. Thus;

14 gallons would cost = 420 * 14 = Ghc 5880

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