Question

20 children are divided into two groups A and B of 12 and 8 respectively. the average marks obtained by the children of group A is 85 and the average marks of all the 20 children is 80. what is the average marks of children of group B.


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Answer 1

Step-by-step explanation:

Marks of B group girls = 1600 - 1020 = 580

average marks of B group girls

= 580/8 = 145/2 = 72.5%