owens finds a rock that has some gold in it . The rock has mass of 125 grams . He removed the gold, which is 18% of the mass of the rock. How much gold does he have ?
Remember that
18%=18/100=0.18
so
Multiply the total weight by the factor 0.18
125*(0.18)=22.5 grams
answer is 22.5 gr