Предмет: Математика, автор: lerabilenka1

Ученики на заводе за 6 часов делает 30 деталей,а мастер за 2 часа 42 детали.За сколько часов сделают 286 деталей мастер и ученик,если будут работать вместе?

Ответы

Автор ответа: SemenIgor

2

1)30:6=5 деталей делают ученики в час
2)42:2=21 деталь делают рабочие в час
3)21+5=26 деталей делают они вместе за час
4)286:26=11 часов

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