A group of 210 students appeared in some test. The mean of 1 3 rd of students is found to be 60. The mean of the remaining students is found to be 78. The mean of the whole group will be :

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A group of 210 students appeared in some test. The mean of 1 3 rd of students is found to be 60. The mean of the remaining students is found to be 78. The mean of the whole group will be :