Kerosine and petrol

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

Result

p =  11.818 %

Solution:

p=100 (4 0.15+7 0.10)/(4+7)=1301111.818211.818%p=100 \cdot \ (4 \cdot \ 0.15+7 \cdot \ 0.10)/(4+7)=\dfrac{ 130 }{ 11 } \doteq 11.8182 \doteq 11.818 \%



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