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Mixture and Alligation Problems and Solution Set 1

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Today I am sharing some important questions of Mixture and Alligation Chapter of quantitative Aptitude which are previously asked in different Bank exams, These questions are very useful for SBI PO Clerk Pre and Mains, IBPS PO & Clerk exams 2017.

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Some examples on Mixture and Alligation of quantitative Aptitude are given below. These questions with shortcut tricks cover all sorts of tricks on Mixture and Alligation. Visitors are requested to carefully read all shortcut examples. These examples here will help you to better understand shortcut tricks on speed time and distance.

Mixture and Alligation Questions

Ques 1. In a mixture of milk and water, the proportion of water by weight was 75%. If in the 60 gms mixture 15 gms water was added, what would be the percentage of water in the new mixture?
(1) 75% 
(2) 88%
(3) 90% 
(4) 100%
(5) None of these

Ques 2. A man purchased 35 kg of rice at the rate of Rs. 9.50 per kg and 30 kg at the rate of Rs. 10.50 per kg. He mixed the two. Approximately, at what price (in Rupees) per kg should he sell the mixture to make 35 per cent profit in the transaction?
(1) 12 
(2) 12.50
(3) 13 
(4) 13.50
(5) 13.25

Ques 3. In 1 kg mixture of sand and iron, 20% is iron. How much sand should be added, so that the proportion of iron becomes 5%?
(1) 3 kg 
(2) 4 gms
(3) 5 gms 
(4) 6 kg
(5) None of these

Ques 4. The wheat sold by a grocer contained 10% low quality wheat. What quantity of good quality wheat should be added to 150 kgs of wheat so that the percentage of low quality wheat becomes 5%?
(1) 150 kgs 
(2) 135 kgs
(3) 50 kgs 
(4) 85 kgs
(5) None of these

Ques 5. When one litre of water is added to a mixture of acid and water, the new mixture contains 20% acid. When one litre of acid is added to the new mixture, then the resulting mixture contains 100/3 % acid. The percentage of acid in the original mixture was
(1) 20% 
(2) 22%
(3) 24%
(4) 25%
(5) 23%

Ques 6. A grocer purchased 2 kg. of rice at the rate of Rs. 15 per kg. and 3 kg. of rice at the rate of Rs. 13 per kg. At what price per kg should he sell the mixture to earn 100/3 % profit on the cost price?
(1) Rs. 28.00 
(2) Rs. 20.00
(3) Rs. 18.40 
(4) Rs. 17.40
(5) None of these

Ques 7. Two barrels contain a mixture of ethanol and gasoline. The content of the ethanol is 60% in the first barrel and 30% in the second barrel. In what ratio must the mixtures from the first and the second barrels be taken to form a mixture containing 50% ethanol?
(1) 1 : 2 
(2) 2 : 1
(3) 2 : 3 
(4) 3 : 2
(5) None of these

8. A milk vendor has 2 cans of milk. The first contains 25% water and the rest milk. The second contains 50% water. How much milk should he mix from each of the containers so as to get 12 litres of milk such that the ratio of water to milk is 3 : 5?
(1) 5 litres, 7 litres
(2) 7 litres, 4 litres
(3) 6 litres, 6 litres
(4) litres, 5 litres
(5) 4 litres, 8 litres

Ques 9. A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 : 2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, the ratio of gold and copper in C will be:
(1) 5 : 7 
(2) 5 : 9
(3) 7 : 5 
(4) 9 : 5
(5) None of these

Ques 10. A container has 30 litres of water. If 3 litres of water is replaced by 3 litres of spirit and this operation is repeated twice, what will be the quantity of water in the new mixture?
(1) 24 litres 
(2) 23 litres
(3) 24.3 litres 
(4) 23.3 litres
(5) None of these

Ans 1. (5) In 60 gm of mixture, Quantity of water = 60 × 75/100 = 45gm
Quantity of milk = 15 gm
After mixing 15 gm of more water, Quantity
of water in the new mixture = 45 + 15 = 60 gm
Quantity of water in 75 gm of mixture = 60 gm
100 gm of mixture will contain 60/75 × 100 = 80% of water

Ans 2. (4) CP of 65 kg of the mixture = Rs. (35 × 9.50 + 30 × 10.50)
= Rs. (332.5 + 315) = Rs. 647.5
Rate per kg of the mixture = Rs 647.5/65
Required rate = 647.5/65 135/100 = Rs 13.50/kg

Ans 3. (1) Amount of iron in 1 kg mixture = 20% of 1000 gms 
= (20 × 1000) / 100 gms = 200 gms
Amount of sand in mixture = (1000 - 200) gms = 800 gms
Now, let the total mixture is x kg in which iron is 20%
According to the question, 5% of x = 200 gm
5% of x = 200 gm
= (5 × x) / 100 = 200
x = (200 × 100) / 5 gms
x = 20000/5 = 4000 gms
Required answer = 4000 gms - 1000 gms = 3000 gms = 3 kg.

Ans 4. (1) Good quality content in 150 kgs of wheat = 90% of 150 = 135 kg.
In new mixture, low quality wheat is 5%, so good quality wheat 95%
5% of the new mixture = 15 kg,
New mixture = (15 × 100) / = 300 kg
Good quality of wheat added = (300 - 150) kg. = 150 kg.

Ans 5. (4) If there be 1 litre of acid in 4 litres of mixture, 
then in case I. Percentage of acid =1 / (4 + 1) × 100 = 20%
Case II, Percentage of acid 2/6 × 100 = 100/%
Percentage of acid in original mixture = 25%

Ans 6. (3) Mixture : 2 kg of rice at Rs.
15/kg + 3 kg of rice at Rs. 13/kg
Total weight = 2 + 3 = 5 kg
Total cost price = (2 × 15) + (3 × 13) = 30 + 39 = Rs. 69
Cost price per kg of the mixture 69/5 = Rs 13.80
Selling price to get 100/3 % profit 
= (10 + 100/3)/100 × Rs 13.80 Rs 18.40

Ans 7. (2)
Ans 8. 3

9. (3) In 1 kg of alloy A,
Gold = 7/18
Copper = 2/9
In 1 kg of alloy B,
Gold = 7/18 Copper = 11/18
Ratio of gold and copper in Alloy C
7/9 + 7/18 : 2/9 + 11/18 = 21 : 15 = 7 : 5

Ans 10. (3) Suppose a container contains x units of liquid from which y units are taken out and replaced by water. After n operations, the quantity of pure liquid
= x (1 - y/x)units
Remaining water
=30 (1 - 3/30)2 = (30 × 9 × 9)/100 = 24.3 litres

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