Find the radius of the circle x²+y²-4x+6y=12

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The yield per acre produced by Bangladesh is what percent of the total yield per acre produced by all countries?

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If the yield per acre is arranged in ascending order, then what is the difference between the yield per acre of first three countries and last three countries?

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The yield per acre of India is what percent more than that of Pakistan?

A cylindrical container of 32 cm height and 18 cm radius is filled with sand. Now all this sand is used to form a conical heap of sand. If the height of the conical heap is 24 cm, what is the radius of its base? 

The diameters of two cylinders are in the ratio 3:2 and their volumes are equal. The ratio of their heights is

The number of coins of radius 0.75 cm and thickness 0.2cm required to be melted to make a right circular cylinder of height 8 cm and base radius 3 cm is:

How many hemispherical balls can be made from a cylinder 56 cm high and 12 cm diameter, when every ball being 0.75 cm in radius?