Предмет: Математика, автор: LoveZayn

Ученик, готовясь к экзаменам, запланировал решать ежедневно 12 заданий. Однако он решал каждый день на 4 задания больше, и за 3 дня до экзаменов ему осталось решить 8 заданий. Сколько дней ученик готовился к экзаменам?

Ответы

Автор ответа: fedorkholod123

х - количество дней до экзаменов
12 * х - запланировано решить
(12 + 4) * (х - 3) - уже решено + 8 заданий осталось
Уравнение: 16(х - 3) + 8 = 12х
16х - 48 + 8 = 12х
16х - 12х = 48 - 8
4х = 40
х = 40 : 4
х = 10
Проверка: 16 * (10 - 3) + 8 = 12 * 10
112 + 8 = 120
120 = 120
Ответ: 10 дней ученик готовился к экзаменам.

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