Question

In what ratio must water be mixed with milk worth Rs 6.00 per litre. So as to gain 25% by selling the mixture at cost price.
1. 2 : 9
2. 1 : 4 
3. 1 : 5 
4. 1 : 6
5. None of these

Answer 1

Correct Answer - Option 2 : 1 : 4 

Given 

Cost price of Milk = Rs 6/litre

Calculation

We want to sell the mixture at cost price and still gain 25%.

So, we simply add 25% of water

25% of water means = 25/100 = 1/4

so, the ratio of water and milk to gain 25% profit = 1 : 4 

∴ The required answer is 1 : 4.