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- Question
In a History examination, the average for the entire class was 80 marks. If 10% of the students scored 35 marks and 20% scored 90 marks, what was the average marks of the remaining students of the class ?
Options- A. 25
- B. 50
- C. 75
- D. 100
- Correct Answer
- 75
ExplanationLet the number of students in the class be 100 and let this required average be x.
Then, (10 * 95) + (20 * 90) + (70 * x) = (100 * 80)
=> 70x = 8000 - (950 + 1800) = 5250
=> x = 75.
- 1. A number is decreased by 10% and then increased by 10%. The number so obtained is 10 less than the original number. What was the oiginal number ?
Options- A. 1000
- B. 2000
- C. 3000
- D. 4000 Discuss
- 2. The ratio 5 : 4 expressed as a percent equals :
Options- A. 12.5 %
- B. 40 %
- C. 80 %
- D. 125 % Discuss
- 3. A's salary is 40% of B's salary which is 25% of C's salary. What percentage of C's salary is A's salary ?
Options- A. 10
- B. 20
- C. 30
- D. 40 Discuss
- 4. What percent of 7.2 kg is 18 gms ?
Options- A. .25%
- B. .5%
- C. .75%
- D. 1% Discuss
- 5. A salesman gets commission on total sales at 9%. If the sale is exceeded Rs.10,000 he gets an additional commission as bonus of 3% on the excess of sales over Rs.10,000. If he gets total commission of Rs.1380, then the bonus he received is:
Options- A. Rs.180
- B. Rs.120
- C. Rs.480
- D. data insufficient Discuss
- 6. The ratio of earnings of A and B is 4:5. If the earnings of A increase by 20% and the earnings of B decrease by 20%, the new ratio of their earnings becomes 6:5. What are A's earnings?
Options- A. Rs.22,000
- B. Rs.27,500
- C. Rs. 26,400
- D. Cannot be determined Discuss
- 7. 270 candidates appeared for an examination, of which 252 passed. The pass percentage is :
Options- A. (91 + 1/3)%
- B. (93 + 1/3 )%
- C. (97 + 1/3 )%
- D. (98 + 1/3) % Discuss
- 8. If the pice of sugar rises from Rs. 6 per kg to Rs. 7.50 per kg, a person, to have no increase in his expenditure on sugar, will have to reduce his consumpion of sugar by
Options- A. 15
- B. 20
- C. 25
- D. 30 Discuss
- 9. 1100 boys and 700 girls are examined in a test; 42% of the boys and 30% of the girls pass. The percentage of the total who failed is :
Options- A. 58
- B. 62 *2/3
- C. 64
- D. 67 Discuss
- 10. A housewife saved Rs. 2.50 in buying an item on sale. If she spent Rs. 25 for the item, approximately how much percent she saved in the transaction ?
Options- A. 8
- B. 9
- C. 10
- D. 11 Discuss
Percentage problems
Search Results
Correct Answer: 1000
Explanation:
Let the original number be x.
Final number obtained = 110% of (90% of x) =(110/100 * 90/100 * x) = (99/100)x.
x-(99/100)x=10
=> x =1000
Correct Answer: 125 %
Explanation:
5 : 4 = 5/4 = ( (5/4) x 100 )% = 125%.
Correct Answer: 10
Explanation:
A's Salary = 40% of B = 40% of (25% of C) = 40/100[(52/100)*100] % of C = 10% of C.
Correct Answer: .25%
Explanation:
Required percentage = (18/7200 * 100)% = 1/4% = 0.25%
Correct Answer: Rs.120
Explanation:
Commission up to 10000 = = 900
Again after 10000,
Commission : Bonus
9 : 3
3x : x
Therefore, Bonus =
Correct Answer: Cannot be determined
Correct Answer: (93 + 1/3 )%
Explanation:
Pass percentage =[(252/270)*100] % =280/3 % = 9 %
Correct Answer: 20
Explanation:
Let original consumption = 100 kg and new consumption = x kg,
So, 100 * 6 = x * 7.50 => x = 80kg
Reduction in consumption = 20%.
Correct Answer: 62 *2/3
Explanation:
Total number of students = 1100 + 700 = 1800.
Number of students passed = (42% of 1100 + 30% of 700) - (462 + 210) = 672.
Number of failues = 1800-672 = 1128.
Percentage failure = (1128/1800 * 100 )% = 62 * 2/3 %.
Correct Answer: 9
Explanation:
Actual price = Rs. (25 + 2.50) = Rs. 27.50.
Saving = 2.50
Percentage Saving = [(2.50/27.50)*100]
= 2500/275
= %
%
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