A drum contains 80 litres of ethanol. 20 litres of this liquid is removed and replaced with water. 20 litres of this mixture is again removed and replaced with water. How much water (in litres) is present in this drum now?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3. i.e. 35.
Remaining water in the drum = 80 – 83
= 80 – 5 × 3 × 3
= 80 – 45
= 35 litre