Answers

2015-05-20T14:48:45+05:30
Tea = 35 coffee = 20
tea + coffee - both = 40 
⇒ 35+20 - both = 40
⇒ 55 - both = 40 
⇒ both = 15
SO 15 students drink both coffee &tea
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2015-05-20T14:55:24+05:30
If there are 40 students then how can you say that 20 drink tea & 35 tea because if both are added then it makes 55 but there are only 40 students in the class

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