 
 <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. <ibo> Ụnyaahụ, tupu ọ gawa ịnakọta okwute, o nwere 48 - 6 = 42 nke ihe ndị e nwetara na mineral. O nwere 1 / 2 nke ọnụ ọgụgụ nkume dị oké ọnụ ahịa, ya mere o nwere 42 / 2 = 21 ihe atụ nkume dị oké ọnụ ahịa. N'ihi ya, azịza ya bụ 21. 