Question

В пустой бассейн каждую минуту начали наливать по 40 л воды, а выливать по 15 л. Через какое время в бассейне будет 100 л воды7

Answer 1

1)40-15=25(л) оставалось
2)100:25=4(мин)
Ответ: через 4 минуты

Answer 2

1)40-15=25(л) оставалось
2)100:25=4(мин)
Через 4 минуты будет в бассейне 100 л воды

Answer 3

Calculation of Water in the Empty Pool

To calculate the time it takes for the pool to have 100 liters of water, we need to consider the rate at which water is being added and subtracted from the pool.

According to the information provided, water is being added to the pool at a rate of 40 liters per minute and being drained at a rate of 15 liters per minute.

Let's denote the time it takes for the pool to have 100 liters of water as 't' minutes.

During this time, the amount of water added to the pool is 40 liters per minute multiplied by 't' minutes, which is 40t liters.

The amount of water drained from the pool is 15 liters per minute multiplied by 't' minutes, which is 15t liters.

To find the time 't' when the pool has 100 liters of water, we can set up the following equation:

40t - 15t = 100

Simplifying the equation, we get:

25t = 100

Dividing both sides of the equation by 25, we find:

t = 4

Therefore, it will take 4 minutes for the pool to have 100 liters of water.

Note: This calculation assumes that the pool starts empty and there are no other factors affecting the water level, such as evaporation or leaks.