Предмет: Математика, автор: dimazikP

общая масса трёх кусков гранита 156 кг кусок серого гранита тяжелее куска красного на 18 кг,а кусок красного гранита легче куска белогона 15 кг найди массу куска красного гранита

Ответы

Автор ответа: pyffik

0

пусть масса красн. = х, тогда масса серого х+18, а масса белого х+15
общая масса 156, составляем уравнение:
х+х+18+х+15=156
3х+33=156
3х=156-33
3х=123
х=41(кг) - масса красного гранита

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