What is the difference between number of mobile phones of all three brands sold by stores F and B ?

Average number of Nexus mobile phones sold by all the given stores together is by what percent more than the number of BlackBerry mobile phones sold by all the given stores together ?

What is the respective ratio between total number of BlackBerry mobile phones sold by stores C,D and G together and the total number of Apple mobile phones sold by the same store together ?

A rectangular plot has a concrete path running in the middle of the plot parallel to the length of the plot. The rest of the plot is used as a lawn, which has an area of 253 sq m. if the width of the path is 4m and the length of the plot is greater than its breadth by 8m. what is the area of the plot ? (in sq m)

population in Millions

What is the average female population in million?

Area of the circle is 616 cm2. What is the area of the rectangle ?(‘dot’ indicates centre of the circle)