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From a tank of petrol, which contains 500 litres of petrol initially, the seller sells 50litres of petrol each time and replenishes the tank with kerosene. Every time he sells out only 50litres of petrol.After replacing 4th time petrol with kerosene, find the total amount of kerosene in the mixture ?
168.50 litres
185.54 litres
170.75 litres
171.95 litres
Amount of petrol left = 500[1-50/500]4 = 500[9/10]4= 500*6561/10000 = 328.05 Amount of kerosene = 500-328.05 = 171.95litres
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