Correct Answer - Option 4 : 150 litre
Given:
Arun has a mixture of Alcohol and water
Out of 50 litres, 40% is Alcohol.
Formula used:
Percentage = (Part value/Whole value) × 100
Calculation:
Let x litre be the alcohol in the mixture,
And y be the new amount of the mixture
Amount of alcohol in the mixture
⇒ 40% = (x/50) × 100
⇒ x = 20 litre
The amount of alcohol is constant in the mixture
⇒ 10% = (20/y) × 100
⇒ y = 200 litre
The amount of water added is
⇒ 200 - 50 = 150 litre
∴ 150 litre of water is added.