Weight of the solid in air (W1) = 32 gf
Weight of the solid immersed completely in water (W2) = 28.8 gf
(ii) RD of solid = W_1\over W_1 - W_2
= 32\over 32 - 28.8 = 32\over 3.2 = 10
(i) Density of the solid = RD × 1 g cm-3
= 10 × 1 g cm-3 = 10 g cm-3
Volume = Mass\over Density
= 32\over 10 = 3.2 cm3
Hence, volume of solid = 3.2 cm3
(iii) RD of Solid = W_1\over W_1 - W_2 × RD of liquid
10 = 32\over 32 - W × 0.9
10 = 28.8\over 32 - W
10 (32 – W) = 28.8
320 – 10 W = 28.8
10 W = 320 – 28.8 = 291.2
W = 291.2\over 10 = 29.12 gf