Discussion

Explanation:

​​​​​​​Let the initial quantity of bottle be 1 liter.
Let the quantity of whisky Jhanvi stole = s liter.
Now, quantity of whiskey left in the bottle = (1 - s) liter
while quantity of 20% whiskey added = s liter

By applying rule alligation: 

​​​​​​​

Quantity of whisky left with 40% alcoholQuantity of whisky with 20% alcohol = 1010 = 11

∴ 1-ss = 11

⇒ s = 1/2

∴ Jhanvi adds 1/2 of the 20% alcohol whisky.

This means that she drank half of the original bottle of whisky.

Hence, option (a).

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