Can I get help please?

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.

Evaluate the following expression 1/3^2

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)