 
 <translate> Yesterday before her rock collecting trip, she had 48 - 6 = 42 mineral samples. She has 1 / 2 the number of gemstones, so she has 42 / 2 = 21 gemstone samples.
Thus, the answer is 21. <hau> A jiya kafin tafiyarta ta tattara dutsen, tana da 48 - 6 = 42 samfurin ma'adinai. Tana da 1/2 adadin duwatsu masu daraja, don haka tana da 42 / 2 = 21 gemstone samfurori. Saboda haka, amsar ita ce 21. 