Предмет: Математика, автор: golovenkodanil3

ПОЖАЛУЙСТА С ОТВЕТОМ СРОЧНО!!в соревнованиях взяли участие 63 человека причем мальчиков было в двое меньше чем девочек,чем девочек.Сколько девочек и сколько мальчиков взяло участие в соревнованиях?

Ответы

Автор ответа: wwwrises

Решение:

2х + х =63

3х =63

х =63/÷3

х =21 (мальчиков)

теперь, т.к. девочек в 2 раза больше, то:

21×2 =42 (девочек)

Ответ: 42 девочки и 21 мальчик.

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