Discussion
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- Question
- In a class, the number of boys is more than the numbers of girls by 12% of the total strength. The ratio of boys to girls is?
Options- A. 11 : 14
- B. 14 : 11
- C. 25 : 28
- D. 28 : 25
- Correct Answer
- 14 : 11
ExplanationLet the number of boys and girls be x and y respectively. Then
From question, (x - y ) = 12% of (x + y)
? x/y = 3/25 (x + y )
? 25x - 25y = 3x + 3y
? 22x = 28y
? x / y = 28 / 22 = 14 / 11 - 1. A circle and a square have same area. Therefore, the ratio of the side of the square and the radius of the circle is?
Options- A. ?? : 1
- B. 1 : ??
- C. 1 : ?
- D. ? : 1 Discuss
- 2. If 8 : y = y : 18 , then y is equal to?
Options- A. 144
- B. 72
- C. 26
- D. 12 Discuss
- 3. The prices of a scooter and a television set are in the ratio 3 : 2. If a scooter costs Rs. 6000 more than the television set, the price of the television set is?
Options- A. Rs. 6000
- B. Rs. 10000
- C. Rs. 12000
- D. Rs. 18000 Discuss
- 4. The ratio of money with Ram and Gopal is 7 : 17 and that with Gopal and Krishan is 7: 17. If Ram has Rs. 490, Krishan has?
Options- A. Rs. 2890
- B. Rs. 2330
- C. Rs. 1190
- D. Rs. 2680 Discuss
- 5. Total number of students in a class is 95. if the total number of girls in the class is 45, then the ratio of total number if boys to total number girls is
Options- A. 9:10
- B. 7:8
- C. 10:9
- D. 9:11 Discuss
- 6. Three friends divided Rs. 624 among themselves in the ratio 1/2 : 1/3 :1/4. The share of the third friend is?
Options- A. Rs. 288
- B. Rs. 192
- C. Rs. 148
- D. Rs. 144 Discuss
- 7. The ratio of two number is 3 : 4 and thier sum is 420. the greater of the two numbers is?
Options- A. 175
- B. 200
- C. 240
- D. 315 Discuss
- 8. If carton containing a dozen mirrors is dropped, which of the following cannot be the ratio of broken mirrors to unbroken mirrors?
Options- A. 2 : 1
- B. 3 : 1
- C. 3 : 2
- D. 7 : 5 Discuss
- 9. Two whole numbers whose sum is 64, cannot be in the ratio?
Options- A. 5 : 3
- B. 7 : 1
- C. 3 : 4
- D. 9 : 7 Discuss
- 10. The weight of a 13 m long iron rod is 23.4 kg. The weight of 6 m long of such rod wiil be?
Options- A. 7.2 kg
- B. 12.4 kg
- C. 10.8 kg
- D. 18 kg Discuss
Ratio and Proportion problems
Search Results
Correct Answer: ?? : 1
Explanation:
Let the side of the square be 'a' and let the radius of the circle be 'r'
Then, a2 = ?r2
? a2 / r2 = ?
? a / r = ??
? a : r = ?? : 1
Correct Answer: 12
Explanation:
? 18 x 18 = y2
? y = ?144 = 12
Correct Answer: Rs. 12000
Explanation:
Let the price of a scooter be Rs. 3x and that of a television set Rs. 2x.
Then, 3x - 2x = 6000
? x = 6000
? Cost of a television set = 2x
= Rs. 12000
Correct Answer: Rs. 2890
Explanation:
Ram : Gopal = 7 : 17 = 49 : 119
Gopal : Krishan = 7 : 17 = 119 : 289
? Ram : Gopal : Krishan = 49 : 119 : 289
? Ram : Krishan = 49 : 289
Thus, 49 : 289 = 490 : N
&there N = 289 x 490 / 49
= Rs. 2890
Correct Answer: 10:9
Explanation:
Let the total number of boys in the class be x.
Then, according to the question,
x + 45 = 95
x = 95 - 45 = 50
Hence, the required ratio of total number of boys to total number of girls = B:G = 50:45 = 10:9
Correct Answer: Rs. 144
Explanation:
Ratio = 1/2 : 1/3 : 1/4 = 6 : 4 : 3
? share of third friend = Rs. (624 x 3/13)
= Rs. 144
Correct Answer: 240
Explanation:
Greater number = 420 x (4/7) = 240
Correct Answer: 3 : 2
Explanation:
For dividing 12 into two whole numbers, the sum of the terms of the ratio must be a factor of 12. so, they cannot be in the ratio 3 :2.
Correct Answer: 3 : 4
Explanation:
For dividing 64 into two whole number, the sum of the terms of the ratio must be factor of 64, so they cannot be in the ratio 3 : 4.
Correct Answer: 10.8 kg
Explanation:
Less length, less weigth
From question, 13 : 6 : : 23.4 : W
? 13 x W = 6 x 23.4
? W = (6 x 23.4) /13 = 10.8 kg
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