Answer: [tex]h=0.05w[/tex]
Let the whole body weight of a whale be w
Let the weight of the heart be h
It is given that weight of the heart is 5% weight of the whole body weight.
[tex]\Rightarrow h=5 \% \hspace{1mm} of \hspace{1mm} w\\ \Rightarrow h=\frac{5}{100}\times w\\ \Rightarrow h=0.05w[/tex]