Discussion
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- Question
If 3a=4b=6c and a+b+c=2729 , then a2+b2+c2 =?
Options- A. 81
- B. 83
- C. 87
- D. None of these
- Correct Answer
- 87
Explanation= 87
- 1. A number increased to 137 1/ 2% gives 33. The number is?
Options- A. 22
- B. 24
- C. 25
- D. 27 Discuss
- 2. In a college election, a candidates secure 62% of the votes and is elected by majority of 144 votes. The total number of votes polled is?
Options- A. 600
- B. 800
- C. 925
- D. 1200 Discuss
- 3. The population of a town is 8000. It increases by 10% during first year and by 20% during the second year. The population after 2 years will be?
Options- A. 10400
- B. 10560
- C. 10620
- D. None of these Discuss
- 4. A papaya was planted 2 years ago. It increases at the rate of 20% every year. If at present, the height of the tree is 540 cm, what was it when the tree was planted?
Options- A. 324 cms
- B. 375 cms
- C. 400 cms
- D. 432 cms Discuss
- 5. P is six times as large as q. The per cent that q is less than p,is?
Options- A. 831/3
- B. 162/3
- C. 90
- D. 60 Discuss
- 6. A man spends 75% of his income. This income is increased by 20% and he increased his expenditure by 10%. His savings are increased by?
Options- A. 10%
- B. 25%
- C. 371/2%
- D. 50% Discuss
- 7. The boys and girls in a collage are in ratio 3 : 2. If 20% of the boys and 25% of the girls are adults, the percentage of students who are not adults is?
Options- A. 58%
- B. 67.5%
- C. 78%
- D. 82.5% Discuss
- 8. 72% of the students of a certain class took Biology and 44% took Mathematics. If each student took Biology or Mathematics and 40 took both. The total number of students in the class was?
Options- A. 200
- B. 240
- C. 250
- D. 320 Discuss
- 9. 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% Discuss
- 10. 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
More questions
Correct Answer: 24
Explanation:
? 1371/2% of N = 33
? {(275/2) x N} / 100 = 33
? N = (33 x 2 x 100) / 275 = 24
Correct Answer: 600
Explanation:
? (62% of N - 38% of N) =144
? 24% of N = 144
? N = (144 x 100)/24 = 600
Correct Answer: 10560
Explanation:
Population after 2 years
=8000(1 + 10/100) (1 + 20/100)
= (8000 x 11/10 x 6/5) = 10560
Correct Answer: 375 cms
Explanation:
? 540 = H(1 + 20/100)2
? H = (540 x 5/6 x 5/6) = 375 cm
Correct Answer: 831/3
Explanation:
P = 6q. Thus q is less than p by 5q
? q is less than p by = {(6q - q)/6q} x 100%
= ( 5q/6q) x 100 % = 831/3 %
Correct Answer: 50%
Explanation:
Let income = Rs. 100
Then expenditure = Rs. 75 and saving = Rs. 25
New expenditure = 110% of Rs. 75 = Rs. 165 / 2
New saving = Rs. (120 - 165/2) = Rs. 75/2
Increase in saving = Rs. (75/2 - 25) = Rs. 25/2
? Increase% = (25/2) x (1/25) x 100% = 50%
Correct Answer: 78%
Explanation:
Suppose boys = 3N and girls = 2N
Not adults = (80% of 3N) + (75% of 2N) = (12N/5 + 3N/2) = 39N/10
? Required percentage = (39N/10 / 1/5N) x 100 % = 78%
Correct Answer: 250
Explanation:
Let the total number of students be 100
Then, n(A ? B) = n(A) + n(B) - n(A ? B) = (72 + 44 - 100)% = 16%
Now,16% of N = 40
? (16 x N) / 100 = 40
? N = (100 x 40) / 16 = 250
Correct Answer: 84%
Explanation:
Let the number be N.
Then, error = 5N/2 - 2N/5 = 21N/10
? Error percentage = (21N/10) x (2/5N) x 100 % = 84%
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%
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