In a class of 35 students 22 a boys which part of the class are girls? The time of 2 pm, what part of the day has elapsed?
286
483
Ответы на вопрос:
1.
1) 35 - 22 = 13 - girls in the class
2) 13 / 35 - girls part of the class
2.
1) 12 + 2 = 14 (hours) - have passed since 00:00
2) 14 / 24 = 7 / 12 - elapsed part of the day.
Answers: of the class is girls; of the day has elapsed.
допустим, во втором ящике х кг,тогда
х+35+х+х-15=110
3х+20=110
3х=110-20
3х= 90
х=90: 3
х=30 кг во втором ящике
30+35=65 кг в первом ящике
30-15=15 кг в третьем ящике
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