Предмет: Математика, автор: boberon

Количество кувшинок на поверхности озера удваивается каждый день. Известно, что озеро полностью покроется кувшинками через 10 дней. Через сколько дней кувшинками покроется четверть озера?

Решение не нужно (я его знаю), ответ комментарием или в личку, пожалуйста.

Ответы

Автор ответа: ТатМих

Ответ: через 8 дней.

всё озеро -10 дней

1/2 озера -9 дней (за 10-ый день количество кувшинок удвоится, то есть покроется всё озеро)

1/4 часть озера покроется кувшинками через 8 дней (на 9-ый день количество удвоится 1/4+1/4=1/2 озера)

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