Question

Свежая морская капуста содержит 90% воды. после хранения осталось 20%. сколько надо взять свежей морской капусты, чтобы получить 4,5 кг сушёной

Answer 1

Сухая часть составляла 10%, а после сушки будет составлять 80%, значит вес капусты уменьшился в восемь раз. 4,5*8=36

Answer 2

Calculation of Fresh and Dried Seaweed

To calculate the amount of fresh seaweed needed to obtain 4.5 kg of dried seaweed, we need to consider the water content in fresh seaweed and the water loss during the drying process.

According to the information provided, fresh seaweed contains 90% water, and after storage, it retains 20% of its original weight. This means that 80% of the original weight is lost during storage.

To calculate the weight of dried seaweed, we can use the following formula:

Weight of dried seaweed = Weight of fresh seaweed × (1 - Water content after storage)

Let's calculate the weight of fresh seaweed needed to obtain 4.5 kg of dried seaweed:

Weight of fresh seaweed = Weight of dried seaweed ÷ (1 - Water content after storage)

Substituting the given values:

Weight of fresh seaweed = 4.5 kg ÷ (1 - 0.2)

Calculating the result:

Weight of fresh seaweed = 4.5 kg ÷ 0.8 = 5.625 kg

Therefore, you would need approximately 5.625 kg of fresh seaweed to obtain 4.5 kg of dried seaweed.

Please note that the calculation assumes a linear relationship between water content and weight loss during storage. The actual weight loss may vary depending on various factors such as the drying method used and the specific characteristics of the seaweed.

I hope this helps! Let me know if you have any further questions.