Предмет: Математика, автор: toothels

Ручка и блокнот вместе стоят 27 рублей, а 5 ручек и 4 блокнота стоят 130 рублей. Сколько рублей стоит одна ручка?​

Ответы

Автор ответа: Nina1952
6
Пусть Х руб стоит ручка ,
тогда (27-Х) стоит блокнот
5х - стоят 5 ручек
4(27-Х) - стоят 4 блокнота
Известно, что 5 ручек и 4 блокнота стоят 130 руб
Составим уравнение:
5х+4(27-Х)=130
5х+108-4х =130
Х=22 руб - стоит ручка
27-Х=27-22=5 руб - стоит 1 блокнот
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