Answer
Please see the work below.
Work Step by Step
We know that
$P=Fv$
This can be rearranged as:
$F=\frac{P}{v}$............eq(1)
Weight of single person$=67Kg\times 9.8=656.6N$
Weight of n persons$=n\times 656.6N$
We plug in the known values in eq(1) to obtain:
$n\times 656.6N=\frac{330\times 10^3}{16.83}$
This simplifies to:
$n=30$ persons
