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- Question
- A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in the calculation?
Options- A. 82%
- B. 86%
- C. 84%
- D. 89%
- Correct Answer
- 84%
ExplanationLet the number be N.
Then, error = 5N/2 - 2N/5 = 21N/10
? Error percentage = (21N/10) x (2/5N) x 100 % = 84% - 1. If the price of mangoes is decreased by 40%, one could get 32 more mangoes for ? 120. Find the original price of each mango.
Options- A. ? 3.50
- B. ? 2.50
- C. ? 2.25
- D. ? 2.00 Discuss
- 2. A city has a population of 300000 out of which 180000 are males. 50% of the population is literate. If 70% of the males are literate, the number of literate females is
Options- A. 24000
- B. 30000
- C. 54000
- D. 60000 Discuss
- 3. 5% income of A is equal to 15% income of B and 10% income of B is equal to 20% income of C. If income of C is Rs.2000, then total income of A, B and C is?
Options- A. Rs. 6000
- B. Rs. 18000
- C. Rs. 20000
- D. Rs. 14000 Discuss
- 4. For a sphere of radius 10 cms. the numerical value of the surface area is how many per cent of the numerical value of its volume?
Options- A. 24%
- B. 26.5%
- C. 30%
- D. 45% Discuss
- 5. A reduction of 21% in the price of wheat enables a person to buy 10.5 kg more for Rs. 100. What is the reduced price per kg?
Options- A. Rs. 2
- B. Rs. 2.25
- C. Rs. 30
- D. Rs. 2.50 Discuss
- 6. Anirudh secures 85%, 70%, 65% and 60% marks in test papers with 100, 120, 140 and 160, respectively as maximum marks. The percentage of his aggregate is?
Options- A. 652/3%
- B. 686/13%
- C. 661/4%
- D. 651/3% Discuss
- 7. In an examination, 950 boys and 250 girls appeared. 90 % of the boys and 60 % of the girl passed the examination. The percentage of candidates failed is?
Options- A. 16.25%
- B. 16.75%
- C. 16.50%
- D. None of these Discuss
- 8. The population of a town was 150000 three years ago. If it is increased by 2%, 2.5% and 4%, respectively in last 3 years, then the present population is?
Options- A. 163098
- B. 164049
- C. 163154
- D. 164145 Discuss
- 9. In a survey, it was found that 80% of those surveyed owned a car while 60% of those surveyed owned a mobile phone. If 55% owned both a car and a mobile phone, what percent of those surveyed owned a car or a mobile phone or both?
Options- A. 65%
- B. 80%
- C. 85%
- D. 97.5% Discuss
- 10. In an examination, every candidate took Physics or Mathematics or both. 65.8% took Physics and 59.2 % took Mathematics. The total number of candidates was 2000. How many candidates took both Physics and Mathematics?
Options- A. 750
- B. 500
- C. 250
- D. 125 Discuss
Percentage problems
Search Results
Correct Answer: ? 2.50
Explanation:
Let the original price be ? N per kg.
New price per kg = 60% of N = 3N/5
? 120 / (3N/5) - 120/N = 32
? 600/3N - 120/N = 32
? 200/N - 120/N = 32
? 80/N = 32
? N = 80/32 = 2.5
So, the original price is ? 2.50
Correct Answer: 24000
Explanation:
Total population = 300000
Total number of males = 180000
Total Literates = 50% of total population = 150000
Number of literate males = 70% of males = 126000
? Number of literate females = 150000 - 126000 = 24000
Correct Answer: Rs. 18000
Explanation:
? 5% of A=15% of B and 10% of B = 20% of C
? A/20 = 3B/20 and B/10 = C/5
? B = 2C
? A/20 = (3/20) x 2C = 3C/10 =(3/10) x 2000 = 600
? A = (600 x 20) = 12000,
B = (2 x 2000) = 4000
? A + B + C = (12000 + 4000 + 2000) = 18000
Correct Answer: 30%
Explanation:
Surface area sphere = 4? x (10)2
volume sphere=4?/3 x (10)3
= (4000?/3) cm3
? Required percentage = {(400? x 3) / (4000?)} x 100 %
= 30%
Correct Answer: Rs. 2
Explanation:
Let original rate = Rs. P per kg
New rate = 79% of Rs. P per kg
= Rs. (79 x P)/100) per kg
? {(100/79P)/100} - {100/P} = 10.5
? 10000/79P - 100/P = 10.5
? 10000 - 7900 = 10.5 x 79P
? P = 2100/(10.5 x 79)
? P = 2100/(10.5 x 79)
Reduced rate = Rs. (79/100) x 2100/(10.5 x 79) per kg = Rs. 2 per kg.
Correct Answer: 686/13%
Explanation:
Marks secured by Anirudh = [(85/100) x 100] + [(70/100) x 120] + [(65/100) x 140] + [(60/100) x 160]
= (85 + 84 + 91 + 96) = 356
? Required percentage = [356/(100 + 120 + 140 + 160)] x 100 %
= (356/520) x 100% = 686/13%
Correct Answer: 16.25%
Explanation:
Number of failures = 10% of 950 + 40% of 250
= (10/100) x 950 + (40/100) x 250 = (95 + 100) = 195
Fail percentage = [195/(950 + 250)] x 100
= (195/1200) x 100 = 16.25%
Correct Answer: 163098
Explanation:
Percentage population = 150000 x (1 + 2/100) x {1 + (5/2)/100} x (1 + 4/100)
= 150000 x (102/100) x (41/40) x (104/100)
= 163098
Correct Answer: 85%
Explanation:
Percentage of car owners = 80%
Percentage of mobile phone owners = 60%
Percentage of people having both car and mobile phone = 55%
Percentage of people having only car = 80 - 55 = 25%
Percentage of people having only mobile phone = 60 - 55 = 5%
Percentage of people having a car or a mobile phone or both = 55% + 25% + 5% = 85%
Correct Answer: 500
Explanation:
Let x% candidates take both the subjects.
Percentage of candidates who opted Physics = 65.8%
and percentage of candidates who opted Mathematics = 59.2%
? x = (65.8 + 59.2 - 100)% = (125 - 100)% = 25%
Also, total number of candidates = 2000
? Number of candidates who opted both the subjects
= 25 x 2000/100 = 500
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