Known weight: 150kg.
Generally speaking, when making cotton trousers, the density of filled cotton is generally 3-5 kg/bed.
Suppose the density of packed cotton is 4 kg/bed.
According to the weight of cotton trousers = the weight of filled cotton+the weight of trousers fabric, the weight of filled cotton can be calculated:
150/2/4 = 18.75kg。
Therefore, it takes about 1875 kg of cotton to make a pair of cotton trousers for a person weighing 150 kg.