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?

55
50
30
35

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Alligation or Mixture problems
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?

20 liters
10 liters
30 liters
40 liters

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP