Answer 1

Mass of empty density bottle (M₁) =30 g
Mass of bottle + Water (M₂) 75 g
Mass of liquid + Liquidx (M₃)= 65 g
Mass ofwater=M₂—M₁=75—30=45 g

Mass of water in the density bottle =75 — 30 = 45 g
∴ Volume of water in density bottle = 45 cc
and mass of equal volume of liquid in density bottle 65—30 = 35g

R.D. of liquid = `("mass  of  45  cc  of  liquid" )/("mass  of  45  cc  of  water")`= `35/45`=`7/9`

                      =0.77