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An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank?

A. 33.5%

B. 37.5%

C. 40%

D. 50%

1 Answer

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At first tank is filled with 100 % type A petrol. 

 

Type A petrol in % Type B petrol in % Emptying tank
100 0 1st time empty half then fill with type B petrol
50 50 2nd time empty half then fill with type A petrol
75 25 3rd time empty half then fill with type B petrol
37.5 62.5  

So,at end A type petrol will be 37.5%.
 

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