Fill the sand into a paper weight holders, until the lack of. Weigh the sand. 3. find the average strength of the paper is equal to the weight of the paper.
Fill sand into a paper weight until broken. Sand that weighed an average of 3 times the toughness of the paper. Is equal to the weight of the paper received.
Add the sand into the paper put weight until the lack of weight, sand, average 3 times toughness of paper is equal to the weight of the paper is acceptable