Question

В цистерне для полива было 40 т каждый день будут 8 т воды вечером доживают 4т воды через сколько дней вечером в цистерне окажется 20 т воды?

Answer 1

8-4=4т- ежедневный расход воды
20:4=5дней

Answer 2

Problem Analysis

We are given that there are initially 40 tons of water in the irrigation tank. Every day, 8 tons of water are added in the evening, and 4 tons of water are used up during the day. We need to determine how many days it will take for there to be 20 tons of water in the tank in the evening.

Solution

To solve this problem, we can set up an equation to represent the amount of water in the tank each day. Let's assume that the number of days is represented by d.

The amount of water in the tank at the end of each day can be calculated as follows:

Initial amount of water + (Amount of water added each day - Amount of water used each day) * Number of days

Using the given information, we can substitute the values into the equation:

40 + (8 - 4) * d = 20

Simplifying the equation:

40 + 4d = 20

Subtracting 40 from both sides:

4d = -20

Dividing both sides by 4:

d = -5

Since the number of days cannot be negative, we can conclude that it is not possible for there to be 20 tons of water in the tank in the evening.

Therefore, the answer is that it is not possible for there to be 20 tons of water in the tank in the evening.

Conclusion

It is not possible for there to be 20 tons of water in the tank in the evening.