Alligation or Mixture problems
6 liters of milk and water mixture has 75% milk in it. How much milk should be added to the mixture to make it 90% pure?

12 liters
8 liters
10 liters
9 liters

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Alligation or Mixture problems
The average age of 6 members of a family is 20 years. If the age of the servant is included, then the average age increase by 25%. What is the age (in years) of the servant?

50
35
30
55

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