In what proportion must water be added to spirit to gain 20% by selling it at t

Question

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

Options:

A . 2:5

B . 1:5

C . 3:5

D . 4:5

Answer: Option B

Let the C.P be Re.1 per liter
S.P of 1 litre of mix =Re 1,
Gain = 20%
C.P of 1 litre mix =Rs(100/120 x 1) =Re(5/6)
Ratio of water and spirit = 1/6 =5/6 = 1 : 5.

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