Question

Мальчик Купил 7 одинаковых карандашей а девочка купила 11 таких же карандашей и заплатила на 12 руб. больше Сколько стоит один карандаш Сколько заплатил за всю покупку девочки и Сколько заплатил мальчик

Answer 1

1) 11- 7=4 карандаша
2) 12:4=3 рублей карандаш
3) 11• 3 =33рублей заплатила девочка
4) 7•3 =21рублей заплатил мальчик

Answer 2

Calculation of the Cost of One Pencil

To calculate the cost of one pencil, we need to find the difference in price between the total amount paid by the girl and the total amount paid by the boy, and then divide that difference by the total number of pencils purchased.

Let's denote the cost of one pencil as x.

The boy bought 7 identical pencils, so the total cost of the pencils for the boy is 7x.

The girl bought 11 identical pencils and paid 12 rubles more than the boy, so the total cost of the pencils for the girl is 7x + 12.

To find the cost of one pencil, we can set up the following equation:

7x + 12 = 11x

Simplifying the equation:

12 = 11x - 7x 12 = 4x

Dividing both sides of the equation by 4:

x = 12/4 x = 3

Therefore, the cost of one pencil is 3 rubles.

Total Cost of the Girl's Purchase

To calculate the total cost of the girl's purchase, we can multiply the cost of one pencil by the number of pencils she bought, which is 11.

Total cost of the girl's purchase = 3 rubles/pencil * 11 pencils = 33 rubles.

Therefore, the girl paid 33 rubles for her entire purchase.

Total Cost of the Boy's Purchase

To calculate the total cost of the boy's purchase, we can multiply the cost of one pencil by the number of pencils he bought, which is 7.

Total cost of the boy's purchase = 3 rubles/pencil * 7 pencils = 21 rubles.

Therefore, the boy paid 21 rubles for his entire purchase.

In summary: - The cost of one pencil is 3 rubles. - The girl paid 33 rubles for her entire purchase. - The boy paid 21 rubles for his entire purchase.