The sum of deviations of n numbers from 10 and 20 are a, b respectively. If b/a = – 4, then what is the mean of these n numbers ?

If the perimeter of a right-angled triangle is 30 cm and the hypotenuse is 13…

A bicycle wheel of radius 35 cm makes n revolutions in moving 11 km. What…

The ‘law’ is an enterprise that seeks to rule us all from cradle to the…

In this section, each of the following sentences has a blank space followed by four…

Each item in this section has a sentence with three underlined parts labelled as (a),…