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1 .
16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the children of group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of group B?
[ A ]    $233 \over 3$ right
[ B ]    $243 \over 4$
[ C ]    $254 \over 5$
[ D ]    $345 \over 7$
[ E ]    None of these
Answer : Option A
Explanation :

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