Answers

2014-01-30T20:42:35+05:30
Let the weight of all students = x
then x/34 = 42
hence x = 42*34 = 1428....................................(i)
if teacher's(t) weight is included then 
                                         (x+ t) / 35 = 42.4kg
substituting the value of x from (i),
 we get,              1428 + t = 42.4 * 35 
                          which emplies, 1428 + t = 1484
            hence t = 1484-1428 = 56kg
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