Question

From a tank of petrol, which contains 200 litres of petrol, the seller replaces each time with kerosene when he sells 40 litres of petrol(or its mixture). Everytime he sells out only 40 litres of petrol(pure or impure). After replacing the petrol with kerosen 4th time, the total amount of kerosene in the mixture is
A) 81.92L
B) 96L
C) 118.08L
D) None of these

Answer 1

the ANSWER IS C)118.08L
as we have 200 L we remove 40L and add 40L of kerosene so the ratio is 160:40
now we remove another 40L now the remaining mixture is in ratio of 4:1 now find the amount of kerosene in the mixture:57 L
NOW REPEAT the above process for 2 times
ratio for 3rd step is 16:9
ratio for 4rd step is is 64:61
final awser will be 118:08L

Answer 2

heya..

Here is your answer...

From a tank of petrol, which contains 200 litres of petrol, the seller replaces each time with kerosene when he sells 40 litres of petrol(or its mixture). Everytime he sells out only 40 litres of petrol(pure or impure). After replacing the petrol with kerosen 4th time, the total amount of kerosene in the mixture is 118.08L.

C) 118.08L

It may help you...☺☺