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The average weight of 40 students of a c...

The average weight of 40 students of a class is 60 kg .When 10 new students join the class ,the average weight becomes 64 kg .If the average weight of 5 of the new students is 72 kg then what is the average weight (in kg )of the remaining 5 new students ?

A

`85 .5`

B

`86 .5`

C

88

D

86

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