



 
Sheik, Imagine that you unroll the paper into ole long strip. It would be 241 mm (0.241 meters) wide and say L meters long giving an area of 0.241 × L square meters. The weight of the paper is 56 grams per square meter so the paper would weigh 0.241 × L × 56 grams. But you know the weight is 81 kilograms or 81,000 grams so
thus
I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 