Question

Масса четырёх пони на 120 кг больше,чем масса четырёх косуль,и на 30 кг меньше,чем масса семи косуль.Чему равна масса косули? (Считать,что масса всех зверей одного вида одинаковая.)

Answer 1

П-пони 
К-косули 
4П=4К+120кг 
4П=7К-30кг 
4К+120=7К-30
3К=150 
К=50 
Масса одной косули равна 50 кг

Answer 2

Calculation of the Weight of a Deer

To find the weight of a deer, we can use the given information about the weight of four ponies and the weight of seven deer. Let's break down the problem step by step.

1. Let's assume the weight of one deer is x kg. 2. According to the given information, the weight of four ponies is 120 kg more than the weight of four deer. This can be expressed as: - 4 * x + 120 = weight of four ponies

3. The weight of four ponies is also 30 kg less than the weight of seven deer. This can be expressed as: - weight of four ponies + 30 = 7 * x

Now, we can solve these equations to find the weight of one deer (x).

Let's solve the equations:

4 * x + 120 = 7 * x - 30

Rearranging the equation:

3 * x = 150

Dividing both sides by 3:

x = 50

Therefore, the weight of one deer is 50 kg.

Answer

The weight of the deer is 50 kg.