Вопрос школьника по предмету Алгебра
8. В классе 18 учащихся. Для поливки школьного участка каждая девочка принесла по 2 ведра воды, а каждый мальчик – по 5 ведер. Всего было принесено 57 ведер воды. Сколько в классе девочек и сколько мальчиков?
Ответ учителя по предмету Алгебра
В классе Х девочек и ( 18 — Х ) мальчиков
2х + 5( 18 — Х ) = 57
2х + 90 — 5х = 57
— 3х = — 33
Х = 11 ( девочек )
18 — 11 = 7 ( мальчиков )
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