Question

Из молока получают 20% сливок,а из сливок - 25% масла. Сколько нужно молока,чтобы получить 100кг масла?

Answer 1

1) найдем кол-во сливок для пр-ва 100 кг. масла
100 / 0,25 = 400
2) найдем кол-во молока для пр-ва сливок
400/0,20 = 2000
Ответ 2000 литров молока

Answer 2

Calculating Milk Needed to Obtain 100kg of Butter

To calculate the amount of milk needed to obtain 100kg of butter, we can use the given information that 20% of milk yields cream, and 25% of cream yields butter.

Let's calculate the amount of milk needed step by step:

1. Calculate the amount of cream obtained from milk: - 20% of milk yields cream. - Therefore, 20% of milk = 0.20 * milk.

2. Calculate the amount of butter obtained from cream: - 25% of cream yields butter. - Therefore, 25% of cream = 0.25 * 0.20 * milk = 0.05 * milk.

3. Set up the equation to find the amount of milk needed to obtain 100kg of butter: - 0.05 * milk = 100kg.

4. Solve for the amount of milk: - milk = 100kg / 0.05 = 2000kg.

Therefore, to obtain 100kg of butter, 2000kg of milk is needed.