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the thickness of each book = 20mm So, the thickness of 5 books =  the thickness of one paper sheet =0.016mm So, the thickness of 5 paper sheet =   the total thickness of the stack = (100+0.08)mm                                                    =100.08 mm or  
                       this is the usual from
Distance between sun and earth  speed  of light is  The avg. diameter of red blood cells is  the distance of the moon from the earth is  size of the plant cell is  The diameter of the wire on a computer chip is  the height of the Mount Everest is   
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