What is the age of A in a group of 6 students – A, B, C, D, E and F whose average age is 16 years?
Statement I: Total age of B and D is 30 years
Statement II: Total age of E and F is 31 years.
Statement III: Total age of A is 10 years.

The value of $${\sqrt{40+\sqrt{9\sqrt{81}}} }$$ is

The wooden box measure 20 cm by 12 cm by 10 cm. Thickness of wood is 1 cm. The volume of wood to make the box (in cubic cm) is 

If the angles of a triangle are in the ratio of 2:3:7, then find the ratio of the greatest angle to the smallest angle.

The distance between the center of two equal circles each of radius 3 cm, is 10 cm. The length of a transverse common tangent is 

A person from the top of a hill observes a vehicle moving towards him at a uniform speed. It takes 10 minutes for the angle of depression to change from 45 ° to 60 °. After this the time required by the vehicle to reach the bottom of the hill is 

The value of 64 ÷ 2 ×(9÷3) ×3÷9-32 is:

The digit in the unit's place of the number represented by (7⁹⁵ - 3⁵⁸) is: