Question

Из котлована нужно вывезти 1200 т земли.Работают 5 семитонных и 4 пятитонных самосвала.Каждая машина за день сделала 15 рейсов.Закончена ли вся работа?Если нет,сколько земли осталось вывезти?

Answer 1

5*7=35 тонн земли вывозят 5 семитонных грузовика за 1 рейс                          35*15=525 тонн земли вывезли 5 семитонных грузовика за 15 рейсов              4*5=20 тонн земли вывозят 4 пятитонных грузовика за 1 рейс                           20*15=300 тонн земли вывезли 4 пятитонных грузовика за 15 рейсов               525+300=825 тонн земли вывезли грузовики за 1 день                                      1200-825=375 тонн земли осталось вывезти                                                       Ответ: Работа не закончена,осталось еще вывезти 375 тонн земли

Answer 2

To determine if the work is completed and how much soil is left to be removed from the pit, we need to calculate the total amount of soil that can be transported by the trucks in a day and compare it to the amount of soil that needs to be removed.

Let's start by calculating the total capacity of the trucks:

- There are 5 semitones trucks, and each truck has a capacity of 7.5 tons (half of 15 tons). - There are 4 five-ton trucks, and each truck has a capacity of 5 tons.

To calculate the total capacity of the trucks in a day, we can multiply the number of trucks by their respective capacities:

Total capacity of semitones trucks = 5 trucks * 7.5 tons/truck = 37.5 tons Total capacity of five-ton trucks = 4 trucks * 5 tons/truck = 20 tons

Now, let's calculate the total capacity of all the trucks combined:

Total capacity of all trucks = Total capacity of semitones trucks + Total capacity of five-ton trucks = 37.5 tons + 20 tons = 57.5 tons

The total capacity of all the trucks combined is 57.5 tons.

Next, let's calculate the total amount of soil that needs to be removed:

The required amount of soil to be removed = 1200 tons

Now, we can determine if the work is completed or not. If the total capacity of all the trucks combined is greater than or equal to the required amount of soil to be removed, then the work is completed. Otherwise, we need to calculate the amount of soil left to be removed.

Total capacity of all trucks >= Required amount of soil to be removed

57.5 tons >= 1200 tons

Since 57.5 tons is not greater than or equal to 1200 tons, the work is not completed. To calculate the amount of soil left to be removed, we subtract the total capacity of all the trucks combined from the required amount of soil to be removed:

Amount of soil left to be removed = Required amount of soil to be removed - Total capacity of all trucks = 1200 tons - 57.5 tons = 1142.5 tons

Therefore, there are 1142.5 tons of soil left to be removed from the pit.