DARE TO SOLVE DAY 4

My Scooty gives an average of 40kmpl of petrol.But after recent filling at the new petrol pump,its average dropped to 38kmpl,I investigated and found out that it was due to adulterated petrol.Petrol Pumps add Kerosene,which is 2/3 cheaper than Petrol,to increase their Profits.Kerosene generates excessive smoke and knocking and gives an average of 18km per 900ml. If I paid Rs.30 for a ltr of petrol,what was the additional amount the pump-owner was making?

 Explanation:

Given that the Capacity of Kerosene=(18/900)*1000=20km/ltr

Cost of Petrol=Rs.30/ltr(Given)

Cost of Kerosene=2/3(Cheaper than Petrol)=1/3 (Petrol)=Rs.10/ltr

Let the Quantity of Kerosene is x ltr in 1 ltr of mixture

Capacity of Kerosene=20km/ltr

Capacity of Petrol=40km/ltr

If there is x Ltr Petrol in 1 Ltr

Then,

20(x)+40(1-x)=38

x=0.1 ltr

Cost of mixture = 10(.1) +30(.9)=Rs.28

The Cost of Petrol which I gave was Rs.30 but the Original Amount is Rs.28

Hence the Additional Amount that the Pump Owner was Charging =Rs.30-Rs.28=Rs.2