Question

За 5 тетрадей и 4 записных книжки заплатили 330 руб. Одна книжка дороже тетради на 15 руб дороже чем одна тетрадь. Сколько стоит одна тетрадь?

Answer 1

Ответ:54

Пошаговое объяснение:

15•4=60

330-60=270

270:5=54

Answer 2

#### Problem Analysis We are given the information that 5 notebooks and 4 notepads were purchased for a total of 330 rubles. Additionally, we know that one notebook is 15 rubles more expensive than one notepad. We need to determine the cost of one notepad. #### Solution Let's assume the cost of one notepad is **x** rubles. Since one notebook is 15 rubles more expensive than one notepad, the cost of one notebook would be **x + 15** rubles. According to the given information, the total cost of 5 notebooks and 4 notepads is 330 rubles. We can set up the following equation to represent this information: **5 * (x + 15) + 4 * x = 330** Simplifying the equation: **5x + 75 + 4x = 330** Combining like terms: **9x + 75 = 330** Subtracting 75 from both sides: **9x = 255** Dividing both sides by 9: **x = 28.33** Therefore, the cost of one notepad is approximately **28.33 rubles**. #### Answer The cost of one notepad is approximately **28.33 rubles**.