If the sperm (haploid cell of an organism contains 12 chromosomes, what would be the
number of chromosomes found in a regular body
(diploid) cell?

24,(sperm is haploid which means half, if you look for a diploid cell then multiply that haploid number by 2)

This invention had two important consequences: it improved the quality of the thread, which meant that the cotton industry was no longer dependent on wool or linen to make the warp, and it took spinning away from the artisans' homes to specific locations where fast-flowing streams could provide the water power needed .