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oil and kerosene are present in ratio of 5 : 7 in a liquid. Few litres of mixture of mixture are replaced with petrol. Ratio of oil : kerosene: petrol is 35 : 49 : 18 respectively. Amount of oil removed from mixture is 21 litres less than that of petrol added to the mixture. And amount of oil removed is 6 litres less than that of difference mentioned. Petrol is replacing the mixture removed hence; quantity of mixture is not changing. What is the difference between quantity of kerosene in old mixture and amount of oil in new mixture?
1. 53 litres
2. 31 litres
3. 49 litres
4. 30 litres
5. 27 litres

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Correct Answer - Option 3 : 49 litres

Solution:

Given:

Oil : Water = 5 : 7

Ratio of oil : kerosene: petrol = 35 : 49 : 18

Amount of oil removed + 21 = Amount of petrol added

Calculation:

Amount of oil removed = 21 - 6

⇒ Amount of oil removed = 15 litres

⇒ Amount of petrol added = 15 + 21

⇒ Amount of petrol added = 36 litres

⇒ Amount of oil in new mixture = 36 × 35/ 18

Amount of oil in new mixture = 70 litres

⇒ Amount of kerosene in new mixture = 49 × 36/ 18

⇒ Amount of kerosene in new mixture = 98 litres

Total quantity of mixture = 204 litres

⇒ Amount of kerosene in old mixture = 7 × 204/ 12

Amount of kerosene in old mixture = 119 litres

Difference required is 119 – 70 = 49

required difference is 49 litres

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