Answer
a). 77.3 kg (rounded)
b). 0.0733$\,m^{3}$ , 77.3 L
Work Step by Step
a). 1 kg= 2.2 lb
170 lb = $170 \times \frac{1}{2.2} \,kg= 77.3 \,kg$ (rounded)
b). The person's density is same as that of water and its density is 1000 $kg/m^{3}$
Now, $Volume=\frac{Mass}{Density}$
$Volume=\frac{77.3 kg}{1000kg/m^{3}}=0.0773 m^{3}$
Also, $1 m^{3} = 1000 L$
So, $0.0773m^{3}=77.3L$
1 L of water is equivalent to 1 kg mass. So the numerical value of volume would be same as the mass when expressed in L. So, it is convenient to express the volume in L.
