In 30 litres of milk and water water is only 20 How many litres of water should be added to it to in...........

Quant (SSC) Percentage

In 30 litres of milk and water, water is only 20%. How many litres of water should be added to it to increase the percentage of water to 60% ?

24 litres

6 litres

30 litres

20 litres

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Explanation:

To solve this question, we can apply a short trick approach;
Required litres of water = A{(100 – x) – (100 – y)} /(100 - y)
Where,
A is the quantity of mixture = 30 ltrs
x is the initial percent of water = 20%
y is required percent of water = 60%
By the short trick approach, we get
= 30{(100 – 20) – (100 – 60)} / (100 - 60)
= 30 x (80 - 40) /40 = 30 litres