Question

A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?

A) 10 liters B) 20 liters C) 30 liters D) 40 liters

Answer 1

Step-by-step explanation:

Answer: B) 36.45L

Explanation:

General Formula:

Final or reduced concentration = initial concentration x (1−amount being replaced in each operationtotal amount)n

where n is the number of times the same operation is being repeated. The "amount being replaced" could be pure or mixture as per the case. similarly ,"total amount" could also be either pure or mixture. Here amount being replaced denotes the quantity which is to be withdrawn in each time.

Therefore, 50×(1−550)3

= 36.45 L

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