У Ани всего 12 оценок, четвёрки и пятёрки. Средний бал 4,75. Сколько всего пятёрок у Ани?

У Ани всего 12 оценок, четвёрки и пятёрки. Средний бал 4,75. Сколько всего пятёрок у Ани?
- Предмет:
  Математика
- Автор:
  clara
- 5 лет назад

Ответы 1

Пусть количество четверок=хколичество пятерок=уТогда х+у=12, так как общее количество оценок 12Чтобы найти средний бал, нужно сложить все оценки и поделить на общее их количество,т.е.(4*х+5*у):(х+у)=4,75решаем систему уравненийх+у=12,(4*х+5*у):(х+у)=4,75выражаем х=12-у и подставляем в другое уравнение
- Автор:
  travis87
- 5 лет назад
- 0
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У Ани всего 12 оценок, четвёрки и пятёрки. Средний бал 4,75. Сколько всего пятёрок у Ани?

Ответы 1

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