yasminothman02
23.08.2019 •
Mathematics
The mean weight of 60 students of a class is 40 kg the mean weight of boys is 50 kg while that of the girls is 30 kg find the number of boys and girls in the school
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Ответ:
Total weight of boys, plus total weight of girls, equals total weight of all students
50b + 30(60-b) = 60*40=2400
50b + 1800 - 30b = 2400
20b = 600
b = 30
30 boys and 30 girls
Ответ:
2)14
3)6
4)7
5)21
6)68