(Sample Material) India Post Payments Bank (IPPB) Study Kit "Numerical Ability - Alligation or Mixture"
Sample Materials of India Post Payments Bank (IPPB) Study Kit
Subject: Numerical Ability
Topic: Alligation or Mixture
1. One type of liquid contains 25% of milk, the other contains 30% of milk. A container is filled with 6 parts of the first liquid and 4 parts of the second liquid. The percentage of milk in the mixture is
(1) 27%
(2) 31%
(3) 29 %
(4) 33%
(5) None of these
2. A mixture of 45 L of spirit and water contains 20% of water in it. How much water must be added to it make the water 25% in the new mixture?
(1) 5 L
(2) 3 L
(3) 4 L
(4) 6 L
(5) None of these
3. Two groups of students, whose average ages are 20 yr and 30 yr, combine to form a third group whose average age is 23 yr. What is the ratio of the number the first group to the number of students in the second group?
(1) 5 : 2
(2) 2 : 5
(3) 7 : 3
(4) 2 : 8
(5) None of these
4. John stole some whisky from a bottle his father had kept away in the cupboard. This bottle of whisky contained 50% alcohol. John replaced what he had drunk by another brand of whisky which contained only 25% alcohol. The whisky in the bottle now has only 35% alcohol. How much of the bottle did John steal?
(1) 3/5
(2) 2/5
(3) 4/5
(4) 2/3
(5) None of these
5. A mixture of 20 kg of spirit and water contains 10% water. How much water (in kg) must be added to this mixture to raise the percentage of water to 25%?
(1) 30
(2) 8
(3) 5
(4) 4
(5) None of these
