Question

Срочно!!!! две задачи 1. Если ученик купит на сои деньги 8 карандашей, то у него останется 4копейки, а для покупки 10 карандашей у него не хватает 20 копеек . Сколько денег у ученика? 2. 68 стульев и 56 столов стоят вместе 6136 рублей. Сколько стоят каждый стол и стул по отдельности, если стол и стул вместе стоят 107 рублей? РЕШЕНИЕ И ОТВЕТ

Answer 1

Ответ:

1. 100 копеек

Пошаговое объяснение:

1) 20+4:2=12 (один карандаш)

2) 12×8=96 (8 карандашей)

3) 12×2=24

4)96+24=120

5) 120-20=100

Answer 2

1. Пусть у ученика Х денег

Составляем уравнение

(Х-4):8=(Х+20):10

10Х-40=8Х+160

2Х=200

Х=100 копеек . У ученика был 1 рубль.

2.  Пусть стул стоит Х рублей

Стол стоит 107-Х

Уравнение:

68Х+56*(107-Х)=6136

(68-56)Х=6136-56*107

12Х=6136-56*107

3Х=1534-14*107=36

Х=12 руб.

107-Х=95 руб

Стул стоит 12 рублей

Стол 95 рублей

Answer 3

Task 1: Calculating the amount of money the student has

To solve this problem, we can set up a system of equations based on the given information.

Let's assume the amount of money the student has is represented by 'x' rubles.

According to the problem, if the student buys 8 pencils, they will have 4 kopeks (0.04 rubles) left. This can be represented as the equation:

8 * pencil_price + 0.04 = x

Similarly, if the student wants to buy 10 pencils, they are short of 20 kopeks (0.20 rubles). This can be represented as the equation:

10 * pencil_price - 0.20 = x

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

Let's solve it step by step:

1. Multiply the first equation by 10 to eliminate the decimals:

80 * pencil_price + 0.40 = 10x

2. Subtract the second equation from the first equation:

80 * pencil_price + 0.40 - (10 * pencil_price - 0.20) = 10x - x

Simplifying the equation:

80 * pencil_price + 0.40 - 10 * pencil_price + 0.20 = 9x

Combining like terms:

70 * pencil_price + 0.60 = 9x

3. Divide both sides of the equation by 9:

(70 * pencil_price + 0.60) / 9 = x

Now we have the value of 'x', which represents the amount of money the student has.

Let's calculate the value of 'x' using the given information.

Please provide the price of one pencil.