Volume of the cone i.e capacity of the cone
$$\displaystyle =\frac{1}{3}\pi r^{2}h$$
$$\displaystyle =\frac{1}{3}\times \frac{22}{7}\times 27\times 27\times 42dm^{3}$$
$$\displaystyle =32076\>dm^{3}$$
$$\displaystyle \therefore $$ No.of person$$\displaystyle =\frac{32076}{2916}=11$$