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In a 50 liter can; milk and water is in the ratio 3 : 1. If the ratio has to be made 1 : 3, then the quantity of water that has to be added further is:
1. 120 litre
2. 100 litre
3. 80 litre
4. 90 litre 

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Correct Answer - Option 2 : 100 litre

Given: 

The ratio of milk and water = 3 : 1.  

The capacity of a can = 50 litre

Calculation: 

Quantity of milk in a can = 50 × (3/4) = 150/4 = 37.5 litre

Quantity of water  in a can = 50 - 37.5 = 12.5 litre 

As per question we need to add water to get quantity = 1 : 3 

⇒ 37.5/(12.5 + x) = 1/3 ,       (cross multiple)

⇒ 112.5 = 12.5 + x 

⇒ 112.5 - 12.5 = x

⇒ x = 100

∴ The quantity of water that has to be added further is 100 litre 

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