Mathematics, 15.07.2019 00:30 edenszigethyow8ajk

The average height of a class of 18 students is 105 cm after arrival of 7 new students the average decrees by 5 cm. find sum of height of all the students of the class.

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The average height of a class of 18 students is 105 cm after arrival of 7 new students the average d...