EASY
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From the 50 litres of milk, 5 litres of milk is taken out and after it 5 litres of water is added to the rest amount of milk. Again, 5 litres of milk and water are drawn out and it is replaced by 5 litres of water. If this process is continued similarly for the third time, the amount of milk left(in litres) after the third replacement is: 

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Important Questions on Averages

EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Two bottles of the same capacity are 35% and 3313% full of orange juice, respectively. They are filled up completely with apple juice and the contents of both the bottles are emptied into another vessel. The percentage of apple juice in the mixture is:
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
How many liters of water should be added to a 30 L mixture of milk and water containing milk and water in the ratio 7 : 3, such that the resultant mixture has 40% water in it?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
A 20 litre mixture contains milk and water in the ratio 3:2. Then 10 litres of the mixture is removed and replaced with pure milk and the operation is repeated once more. At the end of the two removals and replacements, what is the ratio of milk and water in the resultant mixture?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
25 litres of a mixtures contains 30% of spirit and rest water. If 5 litres of water be mixed in it, the percentage of spirit in the new mixture is:
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
A can contain a mixture of two liquids A and B in the ratio 7: 5. When 9 L of mixture is drain off and the can is filled with B, the ratio of A and B becomes 7: 9. How many litres of liquid A was contained by the can initially?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Fifty litres of a mixture of milk and water contains 30 percent of water. This mixture is added to eighty litres of another mixture of milk and water that contains 20 percent of water. Then, how many litres of water should be added th the resulting mixture to obtain a final mixture that contains 25 percent of water?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
How much quantity (in kg.) of wheat costing Rs.84 per kg. must be mixed with 81 kg. of wheat costing Rs.60 per kg. so that on selling the mixture at Rs.75.9 per kg, there is a gain of 15%?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Jar A contains "X" ltr of pure milk only. A 27 ltr mixture of milk and water in the respective ratio of 4:5 is added to Jar A. The new mixture thus formed in Jar A contains 70% milk. What is the value of X?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Two varieties of sugar are mixed together in a certain ratio. The cost of the mixture per Kg is ₹0.50 less than that of the superior and ₹0.75 more than the inferior variety. The ratio in which the superior and inferior varieties of sugar have been mixed is:
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
The ratio of milk to water is 5:4. If two litres of water is added, the ratio becomes 10:9, then find a new amount of water in the mixture.
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
A mixture contains wine and water in the ratio 3:2 and another mixture contains them in the ratio 4:5. How many litres of the latter must be mixed with 3 litres of the former so that the resultant mixture may contain equal quantities of wine and water?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
In what ratio must a mixture of 15% spirit strength be mixed with that of 25% spirit strength to get a mixture of 21% spirit strength?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
18 litres of pure water was added to a vessel containing 80 litres of pure milk. 49 litres of the resultant mixture was then sold and some more quantity of pure milk and pure water was added to the vessel in the ratio of 2: 1. If the resultant ratio of milk and water in the vessel was 4: 1, what was the quantity of pure milk added in the vessel?
MEDIUM
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
8 litres are drawn from a cask full of wine and is then filled with water. This operation is performed three more times. The ratio of the quantity of wine now left in cask to that of total quantity is 16 : 81. How much wine did the cask hold originally?
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
There are two sections A and B of a class, consisting of  36 and 44 Students respectively. If the average weight of section A is 40kg, and that of section B is  35kg. Find the average weight of the whole class.
HARD
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Find the ratio in which rice at ₹7.20 akg be mixed with rice at ₹5.70 a kg to produce a mixture worth ₹ 6.30 a kg.
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Two litres of a mixture of spirit and water contains 12% water. This is added to 3 liters of another mixture of spirit and water containing 5% of water. Find the percentage of water in the resulting mixture?
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
After 30 litres of water was evaporated from a solution of salt and water which had 15% salt, the remaining solution had 20%salt. The quantity of the salt is -
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
The milk and water in two vessels A and B are in the ratio 4:3 and 2:3 respectively. In what ratio, the liquids in both the vessels be mixed to obtain a new mixture in vessel C containing half milk and half water?
EASY
Quantitative Aptitude>Arithmetic>Averages>Mixture and Alligation
Two vessels A and B contain spirit and water in the ratio 5:2 and 7:6 respectively. Find the ratio in which these mixtures can be mixed to obtain a new mixture in vessel C containing spirit and water in the ratio 8:5.