Five cubical wooden blocks having side 10 cm each are joined end to end in a row. What is the cost (in Rs.) of painting the surface of the solid so formed at the rate of 10 paise per cm2?

Find the approximate volume and surface area of a sphere of radius 6 cm. (Use π = 227)

Ram has two spherical balls of radius 10.5 cm each and Meena has six spherical balls of radius 7 cm each. What is the total volume of the balls that Meena has?