Предмет: Математика, автор: Вероникапривет

Если Ваня купит 66 пирожков, то у него останется 4040 рублей, а на покупку 1010 пирожков не хватает 100100 рублей. Сколько рублей останется у Вани, если он купит 77 пирожков?

Вероникапривет: Если Ваня купит 6 пирожков, то у него останется 40 рублей, а на покупку 10 пирожков не хватает 100 рублей. Сколько рублей останется у Вани, если он купит 7 пирожков

Ответы

Автор ответа: Аноним

6 относится к ( y - 40, где y это количество денег у Вани).
10 относится к (у + 100) из этого следует, что 6у + 600 = 10у - 400 т.е. у = 250 ( всего денег у Вани)
Т.к. 6 пирожков = у - 40, то 1 прирожок равен (250 - 40)/6 = 35.
Следовательно 7 пирожков будут стоить 7 × 35 = 245. А у Вани останется 250 - 245 = 5 рублей.
Ответ: 5

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