Percentage
कुल प्रश्न: 40 | पेज 3
21. What is 25% of 25% of 100?
सही उत्तर: [A]
हल (Solution):
Correct Answer: A) 6.25
Solution:
(25/100) * (25/100) * 100 = 625 / 100 = 6.25.
Correct Answer: A) 6.25
Solution:
(25/100) * (25/100) * 100 = 625 / 100 = 6.25.
22. If the radius of a circle is increased by 50%, its area is increased by:
सही उत्तर: [C]
हल (Solution):
Correct Answer: C) 125%
Solution:
Area depends on the square of radius (r^2).
Net increase = 50 + 50 + (50 * 50 / 100) = 100 + 25 = 125%.
Correct Answer: C) 125%
Solution:
Area depends on the square of radius (r^2).
Net increase = 50 + 50 + (50 * 50 / 100) = 100 + 25 = 125%.
23. If the radius of a circle is increased by 50%, its area is increased by:
सही उत्तर: [C]
हल (Solution):
Correct Answer: C) 125%
Solution:
Area depends on the square of radius (r^2).
Net increase = 50 + 50 + (50 * 50 / 100) = 100 + 25 = 125%.
Correct Answer: C) 125%
Solution:
Area depends on the square of radius (r^2).
Net increase = 50 + 50 + (50 * 50 / 100) = 100 + 25 = 125%.
24. 30% of a number when subtracted from 91 gives the same number. Find the number.
सही उत्तर: [B]
हल (Solution):
Correct Answer: B) 70
Solution:
91 - 30% of x = x => 91 = x + 0.3x => 1.3x = 91.
x = 91 / 1.3 = 70.
Correct Answer: B) 70
Solution:
91 - 30% of x = x => 91 = x + 0.3x => 1.3x = 91.
x = 91 / 1.3 = 70.
25. A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:
सही उत्तर: [D]
हल (Solution):
Correct Answer: D) 700 apples
Solution:
Remaining apples = 100% - 40% = 60%.
60% of Total = 420 => Total = (420 * 100) / 60 = 700.
Correct Answer: D) 700 apples
Solution:
Remaining apples = 100% - 40% = 60%.
60% of Total = 420 => Total = (420 * 100) / 60 = 700.
26. If x is 20% less than y, then find the value of (y - x) / y.
सही उत्तर: [A]
हल (Solution):
Correct Answer: A) 1/5
Solution:
Let y = 100, then x = 80.
(y - x) / y = (100 - 80) / 100 = 20 / 100 = 1/5.
Correct Answer: A) 1/5
Solution:
Let y = 100, then x = 80.
(y - x) / y = (100 - 80) / 100 = 20 / 100 = 1/5.
27. In a school, 70% of students are boys and the number of girls is 504. Find the number of boys.
सही उत्तर: [A]
हल (Solution):
Correct Answer: A) 1176
Solution:
Percentage of girls = 100% - 70% = 30%.
30% = 504 => 1% = 504 / 30 = 16.8.
Number of boys (70%) = 70 * 16.8 = 1176.
Correct Answer: A) 1176
Solution:
Percentage of girls = 100% - 70% = 30%.
30% = 504 => 1% = 504 / 30 = 16.8.
Number of boys (70%) = 70 * 16.8 = 1176.
28. If 10% of m is the same as 20% of n, then m : n is equal to:
सही उत्तर: [B]
हल (Solution):
Correct Answer: B) 2 : 1
Solution:
(10/100) * m = (20/100) * n => 10m = 20n => m/n = 2/1.
m : n = 2 : 1.
Correct Answer: B) 2 : 1
Solution:
(10/100) * m = (20/100) * n => 10m = 20n => m/n = 2/1.
m : n = 2 : 1.
29. If 10% of m is the same as 20% of n, then m : n is equal to:
सही उत्तर: [B]
हल (Solution):
Correct Answer: B) 2 : 1
Solution:
(10/100) * m = (20/100) * n => 10m = 20n => m/n = 2/1.
m : n = 2 : 1.
Correct Answer: B) 2 : 1
Solution:
(10/100) * m = (20/100) * n => 10m = 20n => m/n = 2/1.
m : n = 2 : 1.
30. The price of a car depreciates every year by 10%. If its present value is Rs. 3,00,000, what will be its value after 2 years?
सही उत्तर: [B]
हल (Solution):
Correct Answer: B) Rs. 2,43,000
Solution:
Value after 2 years = 300000 * (90/100) * (90/100) = 300000 * 0.81 = Rs. 2,43,000.
Correct Answer: B) Rs. 2,43,000
Solution:
Value after 2 years = 300000 * (90/100) * (90/100) = 300000 * 0.81 = Rs. 2,43,000.