A tank of petrol contains 300 litres of pure petrol initially, Every time a seller sells out 60 litres from the container and replaces

A tank of petrol contains 300 litres of pure petrol initially, Every time a seller sells out 60 litres from the container and replaces each time with 60 liters of kerosene. After replacing the liquid with kerosene 4th time, the total amount of kerosene (in l t) in the mi xture i s?

a)122.88

b) 177.12

c) 170.88

d) 179.14

Sol:

Petrol left after 4 exchange.

Amount of kerosene in mixture is

300 – 122.88 = 177.12