This answer is not correct. The first step in solving this problem is to calculate the total volume of water for the five coins [22.05 mL - 20.20 mL = 1.85 mL]. Divide this number by 5 to obtain the volume for one coin [0.37 mL]. Now divide the mass of one coin by this volume to obtain the density [0.99g ÷ 0.37mL = 2.7 g/mL]