If the volume of a sphere is numerically equal to its surface area then its diameter is:

Let ‘r’ be the radius of the sphere.

Volume of the sphere = 4π r³/3 ……..eq(1)

Surface area of the sphere = 4π r² ……..eq(2)

As per sum, (1) = (2)

4π r³/3 = 4π r²

⇒ r = 3 cm

• A @ B means `A is not smaller than B? A # B means ?A is neither smaller than nor equal to B? A % B means ?A is neither smaller than nor greater than B? A $ B means ?A is not greater than B? A * B means ?A is neither greater than nor equal to B?
• The ratio of the sum of the salaries of A and B to the difference of their salaries is 11 : 1 and the ratio of the sum of the salaries of B and C to the difference of their salaries is also 11 : 1. If A's salary is the highest and C's is the lowest then w
• There are three taps A, B and C in a tank. They can fill the tank in 25 hrs, 20 hrs and 10 hrs respectively. At first all of them are opened simultaneously. Then after 1 hrs, tap C is closed and tap A and B are kept running. After the 4th hour, tap B is a
• Two types of rice (type 1 and type 2) were mixed in the respective ratio of 1 : 3. The mixture was then sold @ 75.60 per kg to gain a profit of 20%. If the price of type 1 rice is Rs. 75 per kg, what is the price of type 2 price per kg?
• X and Y are two alloys which are prepared by mixing zinc and aluminium in the ratio of 1 : 4 and 11 : 8 respectively. If equal quantities of alloys are melted to form a third alloy Z then what is the ratio of zinc and aluminium in alloy Z?