Question

Помогите пожалуйста! Заранее спасибо! На складе было 50 кг белой и зеленой краски. Когда потратили 30% белой и 40% зеленой краски, то на складе осталось 33,5 кг краски. Сколько килограммов белой краски было на складе и сколько зеленой?

Answer 1

Пусть исходное количество белой краски Б килограмм
Тогда зелёной сперва было 50 - Б килограмм.
Потратили 30% - значит, осталось 70%, и белой стало Б*0,7 килограмм
Зелёной израсходовано 40%, осталось 60%, или в килограммах (50 - Б)*0,6.
Суммарное количество белой и зелёной осталось
Б*0,7 + (50 - Б)*0,6 = 33,5
0,7Б + 50*0,6 - 0,6Б = 33,5
0,1Б + 30 = 33,5
0,1Б = 33,5 - 30
0,1Б = 3,5
Б = 3,5/0,1
Б = 35 кг (исходное количество белой краски)
50 - Б = 50 - 35 = 15 кг (исходное количество зелёной краски)

Answer 2

I can help you with your question.

Your question is in Russian, so I will answer in the same language. Here is the translation of your question in English, using Google Translate:

Answer in detail. Please help! Thank you in advance! There were 50 kg of white and green paint in the warehouse. When 30% of the white and 40% of the green paint were spent, there was 33.5 kg of paint left in the warehouse. How many kilograms of white paint were in the warehouse and how many green ones?

To solve this problem, we can use a system of two equations with two unknowns. Let x be the amount of white paint and y be the amount of green paint in the warehouse. Then we have:

x + y = 50 (the total amount of paint in the warehouse) 0.7x + 0.6y = 33.5 (the amount of paint left after spending 30% of white and 40% of green)

We can solve this system by using the substitution method. First, we isolate x from the first equation:

x = 50 - y

Then we substitute x into the second equation:

0.7(50 - y) + 0.6y = 33.5

We simplify and solve for y:

35 - 0.7y + 0.6y = 33.5 -0.1y = -1.5 y = 15

We plug y back into the first equation to find x:

x = 50 - 15 x = 35

Therefore, the answer is:

There were 35 kg of white paint and 15 kg of green paint in the warehouse.

I hope this helps. Have a nice day!