(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Alligation or Mixture

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Alligation or Mixture

1. Pure ghee costs Rs. 100 per kg. After adulterating it with vegetable oil costing Rs. 50 per kg, a shopkeeper sells the mixture @ Rs. 96 per kg, thereby making a profit of 20%. In what ratio does he mix the two?

(a) 1 : 2
(b) 3 : 2
(c) 3 : 2
(d) None of these

2. How many kg of tea worth Rs. 29 per kg must be blended with 25 kg of tea worth Rs. 32 per kg so that by selling the blended variety at Rs. 33 per kg there should be 10% gain?

(a) 45 kg
(b) 33 kg
(c) 25 kg
(d) 50 kg

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?

(a) 5 : 2
(b) 2 : 5
(c) 7 : 3
(d) 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?

(a) 3/5
(b) 2/5
(c) 4/5
(d) 2/3

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%?

(a) 30
(b) 8
(c) 5
(d) 4

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