Question

Фломастер в 3 раза дороже карандаша, но в 2 раза дешевле книги. Сколько стоит книга, если цена карандаша 2 р.? (решение, чертёж.)

Answer 1

2 р.  -  карандаш
? р.  -  фломастер, в 3 раза > карандаша
? р.  -  книга, в 2 раза > фломастера

1) 2 * 3 = 6 р. - стоит фломастер
2) 6 * 2 = 12 р. - стоит книга - ответ.

Answer 2

Solution:

Let's solve the problem step by step.

1. Let's denote the price of the pencil as P and the price of the book as B.

2. According to the given information: - The marker is 3 times more expensive than the pencil: M = 3P - The marker is 2 times cheaper than the book: M = 0.5B

3. We also know that the price of the pencil is 2 rubles: P = 2

4. We need to find the price of the book, so we'll start by finding the price of the marker and then use that to find the price of the book.

Calculations:

Using the given information and the price of the pencil, we can calculate the price of the marker and then the price of the book.

1. Price of the marker: - M = 3P - M = 3 * 2 - M = 6

2. Price of the book: - M = 0.5B - 6 = 0.5B - B = 6 / 0.5 - B = 12

Answer:

The price of the book is 12 rubles.