In a class, there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class is 13 years. What is the average age of the whole class ? (rounded off to two digits after decimal)
A circle of radius 10 cm has an equilateral triangle inscrisbed in it. the length of the perpendicular drawn from the centre to any side of the triangle is
The angles of depression of two ships from the top of a light house are 45° and 30° towards east. If the ships are 200 m apart, find the height of the light house.