For the following questions answer them individually
If a wire is bent into the shape of a square, then the area of the. square so formed is 81cm2. When the wire is rebent into a semicircular shape, then the area, (in cm2) of the semicircle will be
A sphere of radius 5 cm is melted and recast into spheres of radius 2 cm each. How many such spheres can be made?
If cost prices of 100 note books is same as selling price of 80 note books. What is the percent gain ?
Pipes A and B can fill a tank in 6 hours and 8 hours respectively and pipe C can empty the full tank in 12 hours. All three pipes are opened together. but pipe A is closed after 3 hours. In how many hours will the remaining part of the tank be filled?
Which of the following graphical representations of data represents cumulative frequencies ?