Предмет: Математика, автор: polatiusupov

2. Сколько лет брату и сколько лет сестре, если 2 года назад брaт был старше сестры в 2 раза, а 8 лет назад-в 5 раз?​

Ответы

Автор ответа: uservertex1606
0

Ответ:

Брату-х х-2=2(y-2)

сестре-y х-8=5(y-8)

х=2y-2;2y-10=5y-40;3y=30;y=10;х=18

Ответ:10 и 18 лет.

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