Ratio, Proportion
 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

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Let the total number of boys in the class be x.
Then, according to the question,
x + 45 = 95
x = 95  45 = 50Correct Option: C
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
 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 ?

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Ram : Gopal = 7 : 17 = 49 : 119
Gopal : Krishan = 7 : 17 = 119 : 289
∴ Ram : Gopal : Krishan = 49 : 119 : 289Correct Option: A
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
 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 ?

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Let the price of a scooter be Rs. 3x and that of a television set Rs. 2x.
Then, 3x  2x = 6000Correct Option: C
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
 If 8 : y = y : 18 , then y is equal to ?

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∵ 18 x 18 = y^{2 }
∴ y = √144 = 12Correct Option: D
∵ 18 x 18 = y^{2 }
∴ y = √144 = 12
 A circle and a square have same area. Therefore, the ratio of the side of the square and the radius of the circle is ?

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Let the side of the square be 'a' and let the radius of the circle be 'r'
Then, a^{2} = πr^{2}
⇒ a^{2} / r^{2} = π
⇒ a / r = √πCorrect Option: A
Let the side of the square be 'a' and let the radius of the circle be 'r'
Then, a^{2} = πr^{2}
⇒ a^{2} / r^{2} = π
⇒ a / r = √π
∴ a : r = √π : 1