# The mean weitht of 34 student of class9 of a school is 42 kg if , the weight of the ther be included,the mean rises by 400hund gm find the weight of the teacher

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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