Answers

2014-11-03T17:33:25+05:30
Average of 16 students for 15 years = 15 * 16 = 240 One boy aged 18 is left and the average of 15 students = 240 – 18                                                                                 = 222/ 15                                                                                 = 14.8 The average age of 15 students is 14.8
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2014-11-03T17:38:14+05:30
Age of students=15*16=240

Age of student left=18

Average now=240-18
                   =total/no.of students
                   =222/15
                   =14.8
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