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How much will the interest be for Rs. 1900 at 9% per annum for 3 years?

The square root of any prime number is: 

Amir goes to his college from his house at a speed of 4 km/hr and returns at a speed of 2 km/hr. If he takes 4 hours to go and come, find the distance between his house and school.

A small rectangular container intended for holding liquids has dimensions of 25 cm length, 20 cm width, and 15 cm depth. How many liters of liquid can it hold? (Given: 1 liter = 1000 cm³)

A cubic box with a side length of 30 cm needs to be wrapped with decorative paper made of square pieces, each with a side of 6 cm. What is the minimum number of such square pieces required to cover the entire surface of the box?

A cone and a hemisphere have equal curved surface areas and equal radii. Find the ratio of their volumes. 

A right circular cone is cut into two parts of equal height by a horizontal plane. What is the ratio of the volumes of the smaller cone to the frustum?

Expand: (3x - 7)² = ?

A regular right pyramid has a square base with a side length of 12 cm. Its slant height is 8 cm. What is its volume? 

If each exterior angle of a regular polygon measures \(51\frac{3}{7}^\circ\), find the ratio of the number of its diagonals to the number of its sides.