Question 1090401
The club has 140 members, of which 138 listen to music at all. 80 listen to pop,40 listen to rock, 75 to heavy metal. So:
80+40+75=195
And 15+12+10, or 37, listen to 2 types of music.
195-37=158
158-138=20 who listen to all three types of music.
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