Of the 400 members at a health club, 260 use the weight room and 310 use the pool. If at least 60 of the members do not use either, then the number of members using both the weight room and the pool must be between: Choose the correct choice from the following answers:	A) 40 to 100	B) 240 to 280	C) 230 to 260	D) 220 to 300	E) 200 to 260
W=260   P=310   ALL=400   N(NEITHER)=AT LEAST 60   BOTH=?   W+P-BOTH+N=ALL   260+310-BOTH+60=400   BOTH=230   now pay attention to the fact, that both at most can be 260, since W=260   230 to 260
<result>C</result>
Of the 400 members at a health club, 260 use the weight room and 310 use the pool. If at least 60 of the members do not use either, then the number of members using both the weight room and the pool must be between: