Respuesta :

JYLANFIRA124

Answer:

75

Step-by-step explanation:

75. How many litres of a 30% alcohol solution should be added to 40 litres of a 60% alcohol solution to prepare a 50% solution? \ The ratio in which 30% alcohol and 60% alcohol should be mixed to get 50% alcohol is 1 : 2

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

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