There are 60 students in a class and they are divided into three groups A,B,C of 10,20,30 students respectively having average weight W(a),W(b),W(c). Group A and C are merged to form a group D. A student from Group D is shifted to Group B such that average of both the groups decreases. That could be the relation explaining the condition:
a) W(a)

• We have,
  Avg wt. of Grp A= w(a)
  Avg wt. of Grp B= w(b)
  Avg wt. of Grp C= w(c)
  
  Now, Grp A and B are got merged.. Nd let Avg wt. of Grp D= w(d).
  Since Avg wt of Grp B gets decreased when member from Grp D is added. It means,
  w(b)> w(d).
  
  Now, w(d)= (10*w(a)+30*w(c))/40
  Therefore, w(b) > (10*w(a)+30*w(c))/40 On Solving,
  4*w(b) > w(a) + 3*w(c).
  Required Necessary Relation.
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• NOT ABLE TO UNDERSTAND THE QUESTION
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• which student shifted his weight will greater than avg weight of group D and smaller than avg weight of group B.
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• What could be the relation explaining the condition:
  a) W(a)
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• when we will shift persom group D to B thn avg weight of group D decrease and group B increase .it's not possible to decrease group B weight.
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• can any 1 explain i can't understand
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• (10a+30c)/40
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