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How many litres of petrol worth Rs. 85 per litre must be mixed with 60 litres of kerosene worth Rs. 25 per litre so as to gain 20% by selling the mixture at Rs. 90 per litre? 

How many litres of petrol worth Rs. 85 per litre must be mixed with 60 litres of kerosene worth Rs. 25 per litre so as to gain 20% by selling the mixture at Rs. 90 per litre?  Correct Answer 300 litres

S.P of 1 litre of mixture = Rs. 90 and gain = 20%

C.P of 1 litre of mixture = 100/120 × 90 = Rs. 75

C.P of 1 litre petrol, X = Rs. 85

C.P of 1 litre kerosene = Rs. 25

Mean price = Rs. 75 (as shown below)

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Thus, ratio of kerosene ∶ petrol = 10 ∶ 50 = 1 ∶ 5

Let X litres of petrol be mixed with 60 litres of kerosene

⇒ 1 ∶ 5 = 60 ∶ X

∴ X = 60 × 5 = 300 litres

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