Let the total number of boys in the class be x.
Then, according to the question,
x + 45 = 95
x = 95 - 45 = 50

Correct 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

Ram : Gopal = 7 : 17 = 49 : 119
Gopal : Krishan = 7 : 17 = 119 : 289
∴ Ram : Gopal : Krishan = 49 : 119 : 289

Correct 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

Let the price of a scooter be Rs. 3x and that of a television set Rs. 2x.
Then, 3x - 2x = 6000

Correct 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

∵ 18 x 18 = y²
∴ y = √144 = 12

Correct Option: D

∵ 18 x 18 = y²
∴ y = √144 = 12

Let the side of the square be 'a' and let the radius of the circle be 'r'
Then, a² = πr²
⇒ a² / r² = π
⇒ a / r = √π

Correct Option: A

Let the side of the square be 'a' and let the radius of the circle be 'r'
Then, a² = πr²
⇒ a² / r² = π
⇒ a / r = √π
∴ a : r = √π : 1