Question

Одна землеройка уничтожает в течении суток 10г насекомых, 40% из которых являются вредителями леса.Найдите массу вредных насекомых, которых могут уничтожить в течении суток землеройки в лесном массиве площадью 25га, если в среднем на 1га леса приходится 100 землероек.

Answer 1

10:100*40=4г-вредные насекомые

25*100=2500-землероек на 25 га

2500*4=10000г=10кг-вр насекомых могут уничтожить землеройки 

Answer 2

Calculation of the Mass of Harmful Insects Destroyed by a Bulldozer

To calculate the mass of harmful insects that can be destroyed by a bulldozer in a forest area, we need to consider the following information:

- One bulldozer can destroy 10g of insects in a day. - 40% of these insects are harmful to the forest. - On average, there are 100 bulldozers per hectare of forest.

We are given that the forest area is 25 hectares.

To calculate the mass of harmful insects destroyed by a bulldozer in a forest area of 25 hectares, we can follow these steps:

1. Calculate the total number of bulldozers in the forest area: - Since there are 100 bulldozers per hectare, the total number of bulldozers in 25 hectares is 25 * 100 = 2500 bulldozers.

2. Calculate the total mass of insects destroyed by all the bulldozers in a day: - Since each bulldozer destroys 10g of insects in a day, the total mass of insects destroyed by all the bulldozers is 2500 * 10g = 25000g.

3. Calculate the mass of harmful insects destroyed by all the bulldozers in a day: - Since 40% of the insects destroyed are harmful, the mass of harmful insects destroyed is 40% of 25000g = 0.4 * 25000g = 10000g.

Therefore, the mass of harmful insects that can be destroyed by the bulldozers in a forest area of 25 hectares is 10000g.

Please note that the calculation assumes that each bulldozer destroys the same amount of insects and that the distribution of harmful insects is uniform throughout the forest area.