Предмет: Математика, автор: aigera990

2. Матери 40 лет, а возраст ее 2-х сыновей, вместе взятых, равен 28. Через сколько лет возраст матери будет равен возрасту ее сыновей, вместе взятых?

Zalina1984: через 28 лет

Platinum15: через 11 лет

Ответы

Автор ответа: Platinum15

0

Пусть одному сыну х лет, другому у, тогда
х +у = 28
Пусть через Z лет возраст матери будет равен возрасту ее сыновей
тогда:
х+Z + y +Z = 40 +Z
28 + Z = 40
Z = 12

Platinum15: изменила ответ

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