How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?
Number of bricks = volume of the wall/volume of one brick
= (800 x 600 x 22.5)/(25 x 11.25 x 6 )= 6400
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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