In a class avarage hight of 20 students is 105 cm then come to this class 30 students thers avarage is 112 cm then wath is the avarage height of class student
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GIVEN Average height of 20 student is 105 cm
average height of another class 30 student is 112 cm
aveerage height of whole class is 105+112/2=207/2=103.5cm
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