Предмет: Математика, автор: maxxmit

Отцу и матери сейчас вместе 70 лет, а 20 лет назад отец был 1,5 раза старше матери. сколько лет отцу и сколько матери

Ответы

Автор ответа: jekadva

x-20=(70-x-20)*1,5
x-20=(50-x)*1,5
x-20=75-1,5x
x+1,5x=75+20
2,5x=95
x=95:2,5
x=38 лет отцу
70-38=32 года матери

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