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- Question
Each edge of a cube is increased by 20% then the percentage increase in surface area of the cube is :
Options- A. 144%
- B. 40%
- C. 44%
- D. 72.8%
- Correct Answer
- 44%
ExplanationThe surface area of a cube = 6 = 6
New Surface area = 6 x 1.44
Therefore, %
- 1. 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 Discuss
- 2. 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 Discuss
- 3. 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 Discuss
- 4. 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 Discuss
- 5. 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 Discuss
- 6. 60 percent of 2/7 of three-fourth of a number is 2664. What is the number ?
Options- A. 20720
- B. 21352
- C. 25421
- D. 24150 Discuss
- 7. Which value is equal to 5% of 1,500?
Options- A. 35
- B. 55
- C. 75
- D. 45 Discuss
- 8. Twenty percent of Karthik?s monthly salary is equal to thirty two percent of Nikitha?s monthly salary. Vipin?s monthly salary is four fifth that of Nikitha?s monthly salary. If Vipin?s annual salary is Rs. 3.84 lakhs, what is Karthik?s monthly salary?
Options- A. 32,000
- B. 64,000
- C. 40,000
- D. 52,000 Discuss
- 9. If K earns 12% less than L, then how much percent more does L earn than K ?
Options- A. 13.96%
- B. 13.63%
- C. 13.56%
- D. 14.01% Discuss
- 10. Helpers are needed to prepare for the fete. Each helper can make either 2 large cakes or 35 small cakes per hour. The kitchen is available for 3 hours and 20 large cakes and 700 small cakes are needed. How many helpers are required?
Options- A. 10
- B. 15
- C. 20
- D. 25 Discuss
Percentage problems
Search Results
Correct Answer: 52
Explanation:
only (c) is correct since it is divisible by 4.
Let the original number of element be x then the new no.of elements will be
So K must be divisible by 4
Since, x = Kx5/4
Correct Answer: Rs. 4000
Explanation:
Let C's salary be Rs. x
Then B's salary = 80x/100
=> A's salary = (50/100) * (80x/100) = 40x/100
But given total earnings in a month = 22000
=> x + 80x/100 + 40x/100 = 22000
=> x + 120x/100 = 22000
=> x = 10000
=> A's salary = 40 x 10000/100 = Rs. 4000
Correct Answer: 105
Explanation:
Let number of pages in a book = p
According to questions
p - [3p/7 + (2/5 x 4p/7)] = 36
= p - 23p/35 = 36
=> 12p = 36 × 35
p = 105
Correct Answer: 80
Explanation:
Let marks obtained by S = M
R's marks = 0.80M
Q's marks = 1.25 (0.80M)
P's marks = (0.90) (1.25) (0.80M)
= 0.9M
But 0.9M = 360
M = ?
M = 400
Hence % of marks obtained by S
= 400/500 x 100 = 80%.
Correct Answer: 700
Explanation:
Let number of boys = B
Number of girls = G
From the given data,
1B/3 + 1G/2 = 300
But given B/3 = 100
=> B = 300
G/2 = 300 - 100
G = 200 x 2
=> G = 400
Therefore, total number of students in the college = B + G = 700.
Correct Answer: 20720
Explanation:
Let N be the required number.
=>
=> N = 2664x2x7x5/9
=> N = 20720.
Correct Answer: 75
Explanation:
In the question it is asked for 5% of 1500
5 x 1500/100 = 15 x 5 = 75.
Hence, 5% of 1,500 is equal to 75.
Correct Answer: 64,000
Explanation:
From the given data,
20% of K = 32% of N
V = 4/5 N
Given Vipin's salary = 3.84 lpa = 3.84/12 = 32,000 per month
Now, N = 5/4 x 32000 = 40000
Now K = 32/20 x 40000 = 64000
Hence, karthik's monthly salary = Rs. 64000.
Correct Answer: 13.63%
Explanation:
Required % is given by
=>
= 1200/88
= 13.636%
Correct Answer: 10
Explanation:
20 large cakes will require the equivalent of 10 helpers working for one hour. 700 small cakes will require the equivalent of 20 helpers working for one hour. This means if only one hour were available we would need 30 helpers. But since three hours are available we can use 10 helpers.
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