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%.