Question

How many litres of 50% alcohol solution should be added to 60 litres of a 30%
alcohol solution to prepare a 60% solution?​

Answer 1

Answer:

Let x litres of 30% alcohol solution be added.

Then, 30% of x + 60% of 40 = 50% of (x + 40)

⇒ 30x + 60 × 40 = 50 (x + 40)

⇒ 30x + 2400 = 50x + 2000

⇒ 20x = 400

⇒ x = 20

Step-by-step explanation:

just for an example