There are 80 people and 3 clubs M, S, and Z in a company. 20 people joined M, 22 people joined S and 15 people joined Z. If the members of M did not join any other club, at most, how many people of the company did not
join any club?	Choose the correct choice from the following answers:
A) 30	B) 32	C) 34	D) 36	E) 38
Answer E.   key is 'atmost' here.   so 20 people joined M.   22 people joined S and 15 people joined Z. to get maximum people who did not join any club, 15 people who joined Z are among 22 people who joined S.   so 22+20= 
<gadget id="calculator">22+20</gadget>
<output>42</output>
42   80-42= 
<gadget id="calculator">80-42</gadget>
<output>38</output>
38
<result>E</result>
There are 80 people and 3 clubs M, S, and Z in a company. 20 people joined M, 22 people joined S and 15 people joined Z. If the members of M did not join any other club, at most, how many people of the company did not
join any club?