The value of $$5-{8+2\sqrt{15} \over4}-{{1}\over8+2\sqrt{15}}$$ is equal to:

The curved surface area of a cylinder is five times the area of its base. Find the ratio of radius and height of the cylinder.

The interior angle of a regular polygon exceeds its exterior angle by $$90^0$$. The number of sides of the polygon is:

The sum of length, breadth and height of a cuboid is 20 cm. If the length of the diagonal is 12 cm, then find the total surface area of cuboid.

An umbrella is marked for ₹150 and sold for ₹138. The rate of discount is:

A sum of ₹1,50,000 is distributed among three persons - A, B and C - so that they receive 20%, 30% and 50%. respectively. A receives the same amount from another sum of money which is distributed among them so that they receive 50%, 30% and 20%, respectively. Find the total amount received from both sums of money, by B.

If $$x+{16\over x}=8$$, then the value of $$x^2+{32\over x^2}$$ is:

A divisor is 15 times the quotient and 3 times the remainder. If the remainder is 40, find the dividend.