Can someone tell ne the equation of this word problem.

will give brainliest

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.

This is different from the first one can someone me

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?