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The average weight of a class of 50 stud...

The average weight of a class of 50 students is 80 kg. If two of the students with weight 40% & 50% of 'x' leave the class & two new students with weight 'x' & 'x - 10' join the class, then the average weight of the class is increased by 2 kg. Find the value of 'x'?

A

80

B

100

C

90

D

120

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