Предмет: Математика, автор: zaqidullinb

общая масса трех кусков гранита 156.кусок серого гранита тяжелее куска красного на 18 кг,а кусок красного гранита легче куска белого на 15 кг.найди массу куска красного гранита

Ответы

Автор ответа: stiklin

Пусть х кг - масса красного гранита, х + 18 кг - масса серого гранита, тогда х + 15 кг - масса белого гранита
Составляем уравнение:
х + х + 18 + х + 15 = 156
3х + 33 = 156
3х = 123
х = 41 (кг) - масса красного гранита

41 + 18 = 59 (кг) - масса серого гранита
41 + 15 = 56 (кг) масса белого гранита

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A Horse and a Dog
Once upon a time there was a horse whose name was Reginald. Every morning he was delivering dairy products. On his way by the post office he usually met his friend Blackie, who was a little black dog.
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