Alligation or Mixture - Quantitative Aptitude (MCQ) questions for Q. 794

Q.  A tank of 100 litres is filled with kerosene. Ram replaces 10% of kerosene with water and repeats this procedure 4 times. What is the amount of kerosene left in the tank?
- Published on 06 Jul 15

a. 60 litres
b. 65.61 litres
c. 70 litres
d. 65 litres

ANSWER: 65.61 litres
 
As Ram replaces 10% of kerosene with water, the amount of kerosene left is 90%.
As the replacement is done four times,
After 1st replacement, kerosene left is : 0.9*100 = 90 litres
After 2nd replacement, kerosene left is : 0.9*90 = 81 litres
After 3rd replacement, kerosene left is : 0.9*81 = 72.9 litres
After 4th replacement, kerosene left is : 0.9*72.9 = 65.61 litres

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