How many models of 100 do u need to model 3,200

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Write an equation for the function that includes the points (1,4/5) and (2,2/3)