Предмет: Математика, автор: Mc78oJ

общий вес шестиклассника феди иванова и его отца петра иванова составляет 117 кг. вес отца на 3 кг меньше удвоенного веса сына. сколько весит федя иванов

Ответы

Автор ответа: chingizidka

а - вес Феди
вес папы = 2*а-3
а+2а-3=117
3а=120
вес Феди=40
вес папы = 77

а вообще неправильно писать вес, надо писать масса

Автор ответа: Mc78oJ

спс бро^_^

Автор ответа: Аноним

Папа весит Х кг
Федя весит 0,5 * ( х + 3 )
Х + 0,5 * ( х + 3 ) = 117
1,5х = 117 - 1,5
Х = 115,5 : 1,5
Х = 77 ( кг ) вес отца
117 - 77 = 40 ( кг ) вес сына
Ответ 40 кг

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