Question

Школьники трёх классов помогали в уборки картофиля один класс собрал 230 кг картофиля другой на 20 кг больше чем первый но оба класса собрали вместе на 40кг меньше чем третий класс сколько килограммов картофиля было собрано тремя классами

Answer 1

1. 230+20=250(собрал 2 класс)
2. 230+250=480(собрали 1 и2класс вместе)
3. 480-40=440(собрал 3 класс)
4. 250+440+230=920 (собрали все классы вместе)
Ответ: тремя классами вместе было собранно 920кг. картофеля.

Answer 2

Calculation of the Total Weight of Potatoes Collected by the Three Classes

To calculate the total weight of potatoes collected by the three classes, we can use the information provided in the question. Let's break it down step by step:

1. The first class collected 230 kg of potatoes. 2. The second class collected 20 kg more than the first class. 3. The combined weight of the first and second classes is 40 kg less than the third class.

To find the total weight, we need to determine the weight collected by the second class and the weight collected by the third class.

Let's denote: - Weight collected by the first class as x kg. - Weight collected by the second class as x + 20 kg. - Weight collected by the third class as y kg.

According to the given information, we have the following equations:

1. x + (x + 20) = y - 40 (The combined weight of the first and second classes is 40 kg less than the third class.) 2. x = 230 (The first class collected 230 kg of potatoes.)

To solve these equations, we can substitute the value of x from equation 2 into equation 1:

230 + (230 + 20) = y - 40

Simplifying the equation:

480 = y - 40

Adding 40 to both sides:

y = 520

Therefore, the third class collected 520 kg of potatoes.

To find the weight collected by the second class, we substitute the value of x into equation 1:

230 + (230 + 20) = y - 40

Simplifying the equation:

480 = y - 40

Adding 40 to both sides:

y = 520

Therefore, the third class collected 520 kg of potatoes.

To find the weight collected by the second class, we substitute the value of x into equation 1:

x + (x + 20) = y - 40

230 + (230 + 20) = 520 - 40

Simplifying the equation:

480 = 480

This equation is true, which means the weight collected by the second class is 230 + 20 = 250 kg.

In summary, the weight of potatoes collected by the three classes is as follows: - First class: 230 kg - Second class: 250 kg - Third class: 520 kg

Therefore, the total weight of potatoes collected by the three classes is 230 + 250 + 520 = 1000 kg.