Question

Цена тетради снизилась на 2рубля. Теперь за 80 тетрадей надо заплатить столько же,сколько раньше за 70тетрадей. Чему равна новая цена тетради?

Answer 1

80(х-2)=70х

80х-70х=160

х=16 руб. стоила рпньше 1 т.

16-2=14 руб. новая цена

Answer 2

Пусть Х - стоимость тетради до снижения цены. Тогда Х-2 - стоимость тетради после снижения цены.

Х* 70 - стоимость 70 тетрадей по старой цене.

(Х-2)*80 - стоимость 80 тетраде по новой цене.

(Х-2)*80=Х*70 - Решаем уравнение.

80Х-160=70Х

80Х-70Х=160

10Х=160

Х=16

16 - 2 =14 р.

Ответ: новая цена тетради 14р.

 

 

 

Answer 3

Calculation of the New Price of a Notebook

To calculate the new price of a notebook, we need to determine the original price of a notebook and the price reduction. From the given information, we know that the price of a notebook has decreased by 2 rubles. Additionally, we know that the total cost of 80 notebooks is now equal to the cost of 70 notebooks before the price reduction.

Let's assume the original price of a notebook is 'x' rubles.

The total cost of 80 notebooks after the price reduction is 80 * (x - 2) rubles. The total cost of 70 notebooks before the price reduction is 70 * x rubles.

According to the given information, these two costs are equal. Therefore, we can set up the following equation:

80 * (x - 2) = 70 * x

To find the value of 'x', we can solve this equation.

Solving the Equation

Let's solve the equation step by step:

80 * (x - 2) = 70 * x

Expanding the equation:

80x - 160 = 70x

Moving all the terms with 'x' to one side:

80x - 70x = 160

Simplifying:

10x = 160

Dividing both sides by 10:

x = 16

Conclusion

The original price of a notebook was 16 rubles. Therefore, the new price of a notebook after the price reduction is 14 rubles.

Please note that the above calculation is based on the information provided. If there are any additional factors or details that need to be considered, please let me know.