Предмет: Математика, автор: valeriakovalen1

Туристы за два дня прошли 21 км. Во 2-й день было пройдено в 2 раза больше, чем в первый, и ещё 3 км. Сколько прошли во 2-й день? Дайте ответ в километрах.

Ответы

Автор ответа: SuperTomik

В первый день пройдено а км, во второй - b
a+b=21
b=2a+3
a+2a+3=21
3a=18
a=6 км пройдено в первый день
2*6+3=15 км пройдено во второй день

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