This question was previously asked in

DSSSB JE EE 2019 Official Paper (Held on 5 Nov 2019)

- 2 ∶ 3
- 3 ∶ 4
- 1 ∶ 2
- 4 ∶ 5

Option 3 : 1 ∶ 2

Given:

The cost price of wine = Rs. 60 per litre

The cost price of water = Rs. 0 per litre

The cost price of mixture = Rs. 40 per litre

**Calculations:**

Let the quantity of wine and water added in final mixture be x and y respectively.

According to the question:

60 × x + 0y = (x + y) × 40

⇒ 60x = 40x + 40y

⇒ 60x - 40x = 40y

⇒ 20x = 40y

⇒ x : y = 2 : 1

**∴ The ratio in which water and wine should be mixed is 1 : 2.**

__Alternate Method__

**Given:**

The cost price of wine = Rs. 60 per litre

The cost price of water = Rs. 0 per litre

The cost price of mixture = Rs. 40 per litre

**Concept used:**

If two indigents are mixed, then

**Calculation:**

Using alligation,

Ratio of wine and water = 40 : 20 = 2 :1

**∴ The ratio in which water and wine should be mixed is 1 : 2.**

__Important Points__

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