People are riding around on snowmobiles.
There are many people on snowmobiles.
One cannot infer that there are many people.
exists e1 x1 x2.(r_around(e1) & on(e1,x2) & n_snowmobile(x2) & Actor(e1,x1) & v_ride(e1) & n_people(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_snowmobile(x3) & n_people(x2) & n_quantity(x2))