Question

Маша заплатила 30 рублей за 2 тетрадки, 4 ручки и 1 карандаш. Саша заплатил 51 рубль за 4 тетрадки, 5 ручек и 2 карандаша. Сколько денег заплатила Даша за 2 тетрадки, 3 ручки и 1 карандаш? Помогите пожалуйста!!!))

Answer 1

1) 51 - 30 = 21 (р) - стоят 2 тетради, 1 ручка и 1 карандаш

2) 30 - 21 = 9 (р) - стоят 3 ручки

3) 9 : 3 = 3 (р) - стоит одна ручка

4) 21 + 3*2 = 27 (р) - стоят 2 тетради, 3 ручки и 1 карандаш

Ответ: 3. 27 рублей

Answer 2

Calculation of Dasha's Payment

To calculate how much Dasha paid for 2 notebooks, 3 pens, and 1 pencil, we can analyze the information given about the payments made by Masha and Sasha.

According to the information provided: - Masha paid 30 rubles for 2 notebooks, 4 pens, and 1 pencil. - Sasha paid 51 rubles for 4 notebooks, 5 pens, and 2 pencils.

To find out the price of each item, we can calculate the average price per item for both Masha and Sasha.

Let's start by calculating the average price per item for Masha:

- Masha paid 30 rubles for 2 notebooks, so the average price per notebook is 30 rubles / 2 notebooks = 15 rubles per notebook. - Masha paid 30 rubles for 4 pens, so the average price per pen is 30 rubles / 4 pens = 7.5 rubles per pen. - Masha paid 30 rubles for 1 pencil, so the price of the pencil is 30 rubles.

Now, let's calculate the average price per item for Sasha:

- Sasha paid 51 rubles for 4 notebooks, so the average price per notebook is 51 rubles / 4 notebooks = 12.75 rubles per notebook. - Sasha paid 51 rubles for 5 pens, so the average price per pen is 51 rubles / 5 pens = 10.2 rubles per pen. - Sasha paid 51 rubles for 2 pencils, so the average price per pencil is 51 rubles / 2 pencils = 25.5 rubles per pencil.

Now that we have the average prices per item, we can calculate how much Dasha paid for 2 notebooks, 3 pens, and 1 pencil.

- Dasha paid for 2 notebooks: 2 notebooks * 12.75 rubles per notebook = 25.5 rubles. - Dasha paid for 3 pens: 3 pens * 10.2 rubles per pen = 30.6 rubles. - Dasha paid for 1 pencil: 1 pencil * 25.5 rubles per pencil = 25.5 rubles.

Therefore, Dasha paid a total of 25.5 rubles for 2 notebooks, 3 pens, and 1 pencil.

Please note that the prices calculated above are based on the given information and the assumption that the prices of the items are consistent for each person's payment.