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Find volume of pillow
L=78cm
B=55cm
H=25cm
[tex]\\ \bull\tt\longrightarrow V=LBH[/tex]
[tex]\\ \bull\tt\longrightarrow V=25(78)(55)[/tex]
[tex]\\ \bull\tt\longrightarrow V=107250cm^3[/tex]
[tex]\\ \bull\tt\longrightarrow V=10.72m^3[/tex]
Now
Mass=5.5kg
[tex]\\ \bull\tt\longrightarrow Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \bull\tt\longrightarrow Density=\dfrac{5.5}{10.72}[/tex]
[tex]\\ \bull\tt\longrightarrow Density=0.5kg/m^3[/tex]
Density of water=1000kg/m^3
As it is less than density of water it will float on water