There are 60 students in a class. Of these, the average weight of 30 students is 'x' kgs. And the average weight of the remaining 30 students is 'y' kgs. Then find the average weight of the class.
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average of first 30 = sum / 30 = x
then approx sum wieght = 30x
same way approx sum of other 30 = 30y
overall weight = 30x + 30y
axerage weight of class = (30x + 30y)/60
= (x + y )/2
then approx sum wieght = 30x
same way approx sum of other 30 = 30y
overall weight = 30x + 30y
axerage weight of class = (30x + 30y)/60
= (x + y )/2
smritisaraswat:
plz follow if understood the sol.
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total of the first 30 students is 30X and total of the other 30 is 30Y.
average of the whole class is (30X+30Y)/60
which is equal to 0.5(X+Y)
average of the whole class is (30X+30Y)/60
which is equal to 0.5(X+Y)
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