Question

Книга дороже тетради в 5 раз. За книгу и тетрадь заплатили 120 руб. Сколько всего нужно заплатить за 4 такие тетради и 2 такие книги?

Answer 1

1)5+1=6 частей стоят тетрадь и книг вместе
2)120:6=20 рублей стоит тетрадь
3) 20*5=100 стоит книга
4) 100*2+4*20=280 рублей стоят 2 книги и 4 тетради
Ответ 280 рублей

Answer 2

Calculating the Total Cost

To solve this problem, we can use a system of equations. Let's denote the cost of one notebook as x and the cost of one book as 5x. We know that the total cost for one notebook and one book is 120 rubles. This gives us the following equations:

1. x + 5x = 120 (equation representing the total cost for one notebook and one book) 2. 6x = 120 (combining like terms)

We can solve for x using the second equation:

6x = 120 x = 120 / 6 x = 20

So, the cost of one notebook is 20 rubles and the cost of one book is 5 times that, which is 100 rubles.

Total Cost for 4 Notebooks and 2 Books

Now, we need to find the total cost for 4 notebooks and 2 books.

The total cost for 4 notebooks: 4 * 20 = 80 rubles

The total cost for 2 books: 2 * 100 = 200 rubles

Therefore, the total cost for 4 notebooks and 2 books is: 80 + 200 = 280 rubles

So, the total cost for 4 notebooks and 2 books is 280 rubles.