大神求解~
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a)firstly,100-17=83 this is the number of who can speak French or German.
secondly, 55+42-83=14 this is the number of when can speak both.
b)83-14=69 this is the number who can speak only one of these.
c)69-55=14 only speak German 69-42=27 only speak French.
so your can draw the diagram.
secondly, 55+42-83=14 this is the number of when can speak both.
b)83-14=69 this is the number who can speak only one of these.
c)69-55=14 only speak German 69-42=27 only speak French.
so your can draw the diagram.
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