A jar can 20 litre milk. From the jar, 4 litres milk was taken out and replaced

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Question
A jar can 20 litre milk. From the jar, 4 litres milk was taken out and replaced with an equal quantity of water. If 4 litres of the newly formed mixture is taken out of the can, then what is the final quantity of milk left in the can?
Options
A. 14.5 lit
B. 12.8 lit
C. 11.6 lit
D. 10.46 lit

Correct Answer

12.8 lit

Explanation

This can be solved as

$20 {(1 - \frac{4}{20})}^{2} = 20 {(1 - \frac{1}{5})}^{2} = 20 {(\frac{4}{5})}^{2} = 20 (\frac{16}{25}) = \frac{64}{5} = 12.8$

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2. Madhu got 32% of the maximum marks in a Bank examination and failed by 8 marks. However, Kumar who took the same examination got 42% of the total marks and got 16 marks more than the cut-off marks. What was the cut-off marks in the examination ?
Options
A. 76.8
B. 86.8
C. 78.8
D. 84.8

3. If 25% of a number is subtracted from a second number, the second number reduces to its four-sixth. What is the ratio of the first number to the second number ?
Options
A. 4:3
B. 2:3
C. 3:2
D. 5:3

4. In a test, minimum passing percentage for girls and boys is 35% and 40% respectively. A boy scored 483 marks and failed by 117 marks. What is the minimum passing marks for girls ?
Options
A. 625
B. 525
C. 425
D. 325

5. A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in evaluation ?
Options
A. 52%
B. 64%
C. 84%
D. 77%

6. One-third of the boys and one-half of the girls of a college participated in a sport. If the number of participating students is 300, out of which 100 are boys. What is the total number of students in the college ?
Options
A. 550
B. 575
C. 625
D. 700

7. At an examination in which maximum marks are 500. P got 10% less than Q, Q got 25% more than R and R got 20% less than S. If P got 360 marks what percentage of marks was obtained by S ?
Options
A. 77
B. 74
C. 80
D. 83

8. A man reads 3/7 of a book on a day and 2/5 of the remaining, on the second day. If the number of pages still unread are 36, how many pages did the book contain ?
Options
A. 105
B. 101
C. 98
D. 109

9. A earns 50% of B's salary, B earns 80% of C's salary. If the total earnings for a month is Rs. 22000, then what is the earning for A ?
Options
A. Rs. 4000
B. Rs. 4200
C. Rs. 4400
D. Rs. 4600

10. The average of a set of whole numbers is 27.2. when the 20% of the elements are eliminated from the set of numbers then the average become 34. The number of elements in the new set of numbers can be :
Options
A. 27
B. 35
C. 52
D. 63

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