How much space does the dining area take up?

100 guests, each guest requires 3m2 in the dining area, the average mass of each guest is 65 kg,
and the average density of the dining area is 10kg/m2
How I can resolve this problem?

you want to end up with m^2.

100 guest * 3m^2/guest = 300m^2

100 guest * 65kg/guest * 1m^2/10kg = 650m^2

Something's not consistent.