Предмет: Математика, автор: LadyCam

В лыжном кроссе участвуют пятиклассники и шестиклассники. Отношение числа пятиклассников к числу шестиклассников равно 2 : 5.Сколько всего учащихся
принимает участие в лыжном кроссе, если шестиклассников на 15 больше, чем пятиклассников?

Ответы

Автор ответа: USPoloASSN

шестиклассников на 3 части больше(5-2) следует 15 человек это3 части,1 часть=5 (15÷3)
всего семь частей следует пятиклассников 10 (2 части по 5) а шестиклассников 25 (5 частей по 5)

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