p5g2+mp1

[]

mass of cup(g)1.9 volume of water (ml) 50 mass of cup+ 5 marbles (g)26.9 volume of water + 5 marbles (ml) 60 average mass of marble (g)5.0 volume of marbles (cm3) 2 desity of 5 marbles (g/cm3)2.5 density of on marble (g/cm3) 0.5