In what proportion water must be added to spirit to gain 20 by selling it at the cost price ...

In what proportion water must be added to spirit to gain 20% by selling it at the cost price ?

Let the C.P of spirit be = Rs.10 per litre

Then S.P l litre of the mixture = Rs. 11

Profit = 20%

Therefore, C.P of the mixture = Rs. [100/120×10] = Rs. 25/3 per litre

0                    10

          25/3

5/3                 25/3

Therefore, Ratio of water and spirit = 1 : 5

Hence, option 1 is the correct answer.

By: Amit Kumar