1.

Out of a total of 10 students, the average weight of 9 students is 60 kg. If the weight of the 10th students is 9 kg more than the average weight of all the 10 students, then the weight of the 10th student would be:

Answer»

weight = 60 kgNo of students = 9Weight of the 10th student = 9KG more than the average weight of the 10 students. Average weight of 9 students = 60 kg. TOTAL weight of 9 students = 60 x 9 = 540 kg. total weight of 10 students = 540 + x (let the 10th student weight be x)Average weight of 10 students =540 + x/10Weight of 10th student = 9 + 540 + x /10x = x - 9 = 540 + x/1010x - 90 = 540 + x10x - x = 540 + 909x = 630x = 70 kg. Weight of the 10th student is 70 kg.



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