IBM Company Numerical Ability Averages

There are 20 students with an average height of 105 cms in a class. Then 10 students with an average height of 120 cms join the class. What will be the average height of the class now?

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IBM Other Question

has any one got the mail for ibm final interview for the gbs off campus 12th april drive?? i cleared both 2 rounds on 12th april but till today i did not get interview call... how many of you are in this same problem?? 23,8,34,81,33,...