Kerosine and petrol

If 4 liters of petrol containing 15% kerosine are added to another 7 liters of petrol containing 10% kerosine, what percentage of the petrol is kerosine?

Correct answer:

p =  11.8182 %

Step-by-step explanation:

p=100 (4 0.15+7 0.10)/(4+7)=11.8182%

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