Вопрос школьника по предмету Математика
Отец старше сына на 23 года.Если сейчас отцу 56 лет,то сколько лет назад отец был старше в два раза сына ???
А)23
В)20
С)10
D)30
Ответ учителя по предмету Математика
56-23=33-лет сыну сейчас
56-10=46-лет было 10 лет назад отцу
33-10=23-лет было 10 лет назад сыну
Получается 10лет назад
Проверяем :
23•2=46
Всё правильно
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