Question

30 litres of salt solution contains 5% salt. How many litres of water must be added to get a resultant solution containing 3% salt?​

Answer 1

Answer:

20 litres

Step-by-step explanation:

30 litres = 5% × 30 litres = 1.5 litres

To get 3% salt, 1.5/(30+x) = 3%, where x is the water added.

Solve the equation and x=20

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Answer 2

20 litres of water must be added.

Step-by-step explanation:

Given,

Total salt solution = 30 litres,

Percentage of salt = 5%,

Thus, the amount of salt = 5% of 30 = 0.05(30) = 1.5 litres,

The amount of water = 30 - 1.5 = 28.5 litres,

Let x be the amount of water added to solution,

Such that the resultant solution containing 3% salt,

So,

$\frac{1.5}{28.5+x}=\frac{3}{97}$

$145.5=85.5+3x$

$145.5 - 85.5 = 3x$

$60 = 3x$

$\implies x =\frac{60}{3}=20$

Hence, 20 litres of water must be added.

#Learn more :

A salt solution containing 60% salt and another salt solution containing 30% salt are mixed so as to get 20 litres of a 45% salt solution. Find how many litres of each type of solution should be mixed so as to achieve the desired result.

https://brainly.in/question/1248097