Answer :

meerkat18
Let x represent the number of students who liked both chocolate and vanilla ice cream. With this, the number of students who liked chocolate ice cream alone is 140 - x. Similarly, the number of students who liked vanilla ice cream only is 120 - x. The total number of students is 220. 
                            x + (140 - x) + (120 - x) = 220

The value of x is 40. Thus, 40 students liked both chocolate and vanilla. 

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